diff --git a/source/backend/CarlaPlugin.hpp b/source/backend/CarlaPlugin.hpp
index 9452d2404..cfd8603eb 100644
--- a/source/backend/CarlaPlugin.hpp
+++ b/source/backend/CarlaPlugin.hpp
@@ -659,6 +659,11 @@ public:
      */
     virtual void sampleRateChanged(const double newSampleRate);
 
+    /*!
+     * Initialize all RT buffers of the plugin.
+     */
+    virtual void initBuffers();
+
     /*!
      * TODO.
      */
@@ -727,6 +732,34 @@ public:
      */
     void postRtEventsRun();
 
+    // -------------------------------------------------------------------
+    // Post-poned UI Stuff
+
+    /*!
+     * Tell the UI a parameter has changed.
+     */
+    virtual void uiParameterChange(const uint32_t index, const float value);
+
+    /*!
+     * Tell the UI the current program has changed.
+     */
+    virtual void uiProgramChange(const uint32_t index);
+
+    /*!
+     * Tell the UI the current midi program has changed.
+     */
+    virtual void uiMidiProgramChange(const uint32_t index);
+
+    /*!
+     * Tell the UI a note has been pressed.
+     */
+    virtual void uiNoteOn(const uint8_t channel, const uint8_t note, const uint8_t velo);
+
+    /*!
+     * Tell the UI a note has been released.
+     */
+    virtual void uiNoteOff(const uint8_t channel, const uint8_t note);
+
     // -------------------------------------------------------------------
     // Plugin initializers
 
@@ -768,42 +801,9 @@ protected:
     friend struct CarlaPluginProtectedData;
     CarlaPluginProtectedData* const kData; //!< Internal data, for CarlaPlugin subclasses only.
 
-    // -------------------------------------------------------------------
-    // Post-poned UI Stuff
-
-    /*!
-     * Tell the UI a parameter has changed.
-     */
-    virtual void uiParameterChange(const uint32_t index, const float value);
-
-    /*!
-     * Tell the UI the current program has changed.
-     */
-    virtual void uiProgramChange(const uint32_t index);
-
-    /*!
-     * Tell the UI the current midi program has changed.
-     */
-    virtual void uiMidiProgramChange(const uint32_t index);
-
-    /*!
-     * Tell the UI a note has been pressed.
-     */
-    virtual void uiNoteOn(const uint8_t channel, const uint8_t note, const uint8_t velo);
-
-    /*!
-     * Tell the UI a note has been released.
-     */
-    virtual void uiNoteOff(const uint8_t channel, const uint8_t note);
-
     // -------------------------------------------------------------------
     // Cleanup
 
-    /*!
-     * Initialize all RT buffers of the plugin.
-     */
-    virtual void initBuffers();
-
     /*!
      * Delete all temporary buffers of the plugin.
      */
diff --git a/source/backend/engine/CarlaEngineOsc.cpp b/source/backend/engine/CarlaEngineOsc.cpp
index a211df2bf..962d80644 100644
--- a/source/backend/engine/CarlaEngineOsc.cpp
+++ b/source/backend/engine/CarlaEngineOsc.cpp
@@ -477,7 +477,7 @@ int CarlaEngineOsc::handleMsgControl(CARLA_ENGINE_OSC_HANDLE_ARGS2)
     const int32_t rindex = argv[0]->i;
     const float   value  = argv[1]->f;
 
-    plugin->setParameterValueByRIndex(rindex, value, false, true, true);
+    plugin->setParameterValueByRealIndex(rindex, value, false, true, true);
 
     return 0;
 }
diff --git a/source/backend/plugin/CarlaPlugin.pro b/source/backend/plugin/CarlaPlugin.pro
index 8164deda0..acc9b312c 100644
--- a/source/backend/plugin/CarlaPlugin.pro
+++ b/source/backend/plugin/CarlaPlugin.pro
@@ -59,6 +59,7 @@ SOURCES  = \
 
 HEADERS  = \
     CarlaPluginInternal.hpp \
+    CarlaPluginGui.hpp \
     CarlaPluginThread.hpp
 
 HEADERS += \
diff --git a/source/backend/plugin/CarlaPluginGui.cpp b/source/backend/plugin/CarlaPluginGui.cpp
index 44c739b22..abb18ad72 100644
--- a/source/backend/plugin/CarlaPluginGui.cpp
+++ b/source/backend/plugin/CarlaPluginGui.cpp
@@ -15,10 +15,7 @@
  * For a full copy of the GNU General Public License see the GPL.txt file
  */
 
-#include "CarlaPluginInternal.hpp"
-
-#include <QtGui/QMainWindow>
-#include <QtGui/QCloseEvent>
+#include "CarlaPluginGui.hpp"
 
 #ifdef Q_WS_X11
 # include <QtGui/QX11EmbedContainer>
@@ -26,173 +23,133 @@
 
 CARLA_BACKEND_START_NAMESPACE
 
+#include "moc_CarlaPluginGui.cpp"
+
 // -----------------------------------------------------------------------
 // Engine Helpers, defined in CarlaEngine.cpp
 
 extern QMainWindow* getEngineHostWindow(CarlaEngine* const engine);
 
-class CarlaPluginGUI : public QMainWindow
-{
-public:
-    class Callback
-    {
-    public:
-        virtual ~Callback() {}
-        virtual void guiClosedCallback() = 0;
-    };
-
-    CarlaPluginGUI(CarlaEngine* const engine, Callback* const callback);
-    ~CarlaPluginGUI();
-
-    void idle();
-    void resizeLater(int width, int height);
-
-    // Parent UIs
-    void* getContainerWinId();
-    void  closeContainer();
-
-    // Qt4 UIs, TODO
-
-protected:
-    void closeEvent(QCloseEvent* const event);
-
-private:
-    Callback* const kCallback;
-    QWidget* fContainer;
-
-    int fNextWidth;
-    int fNextHeight;
-
-    CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CarlaPluginGUI)
-};
-
 // -------------------------------------------------------------------
 // CarlaPluginGUI
 
-CarlaPluginGUI::CarlaPluginGUI(CarlaEngine* const engine, Callback* const callback)
+CarlaPluginGui::CarlaPluginGui(CarlaEngine* const engine, Callback* const callback, const Options& options)
     : QMainWindow(getEngineHostWindow(engine)),
       kCallback(callback),
       fContainer(nullptr),
-      fNextWidth(0),
-      fNextHeight(0)
+      fOptions(options)
 {
     CARLA_ASSERT(callback != nullptr);
-    carla_debug("CarlaPluginGUI::CarlaPluginGUI(%p, %p)", engine, callback);
-}
+    carla_debug("CarlaPluginGui::CarlaPluginGui(%p, %p)", engine, callback);
 
-CarlaPluginGUI::~CarlaPluginGUI()
-{
-    carla_debug("CarlaPluginGUI::~CarlaPluginGUI()");
+    if (options.parented)
+    {
+#ifdef Q_WS_X11
+        fContainer = new QX11EmbedContainer(this);
+#else
+        fContainer = new QWidget(this);
+#endif
+        setCentralWidget(fContainer);
+    }
+
+#ifdef Q_OS_WIN
+    if (! options.resizable)
+        setWindowFlags(windowFlags() | Qt::MSWindowsFixedSizeDialogHint);
+#endif
 
-    closeContainer();
+    connect(this, SIGNAL(setSizeSafeSignal(int,int)), SLOT(setSizeSafeSlot(int,int)));
 }
 
-void CarlaPluginGUI::idle()
+CarlaPluginGui::~CarlaPluginGui()
 {
-    if (fNextWidth > 0 && fNextHeight > 0)
+    carla_debug("CarlaPluginGui::~CarlaPluginGui()");
+
+    if (fOptions.parented)
     {
-        setFixedSize(fNextWidth, fNextHeight);
-        fNextWidth  = 0;
-        fNextHeight = 0;
+        CARLA_ASSERT(fContainer != nullptr);
+#ifdef Q_WS_X11
+        delete (QX11EmbedContainer*)fContainer;
+#else
+        delete fContainer;
+#endif
+    }
+    else
+    {
+        CARLA_ASSERT(fContainer == nullptr);
     }
 }
 
-void CarlaPluginGUI::resizeLater(int width, int height)
+void CarlaPluginGui::setSize(const int width, const int height)
 {
     CARLA_ASSERT_INT(width > 0, width);
     CARLA_ASSERT_INT(height > 0, height);
+    carla_debug("CarlaPluginGui::setSize(%i, %i)", width, height);
 
     if (width <= 0)
         return;
     if (height <= 0)
         return;
 
-    fNextWidth  = width;
-    fNextHeight = height;
+    emit setSizeSafeSignal(width, height);
 }
 
-void* CarlaPluginGUI::getContainerWinId()
+void* CarlaPluginGui::getContainerWinId()
 {
-    carla_debug("CarlaPluginGUI::getContainerWinId()");
-
-    if (fContainer == nullptr)
-    {
-#ifdef Q_WS_X11
-        QX11EmbedContainer* container(new QX11EmbedContainer(this));
-#else
-        QWidget* container(new QWidget(this));
-#endif
-        setCentralWidget(container);
-        fContainer = container;
-    }
+    CARLA_ASSERT(fContainer != nullptr);
+    carla_debug("CarlaPluginGui::getContainerWinId()");
 
-    return (void*)fContainer->winId();
+    return (fContainer != nullptr) ? (void*)fContainer->winId() : nullptr;
 }
 
-void  CarlaPluginGUI::closeContainer()
+void CarlaPluginGui::setWidget(QWidget* const widget)
 {
-    carla_debug("CarlaPluginGUI::closeContainer()");
+    CARLA_ASSERT(fContainer == nullptr);
+    carla_debug("CarlaPluginGui::setWidget(%p)", widget);
 
-    if (fContainer != nullptr)
-    {
-#ifdef Q_WS_X11
-        delete (QX11EmbedContainer*)fContainer;
-#else
-        delete (QWidget*)fContainer;
-#endif
-        fContainer = nullptr;
-    }
+    setCentralWidget(widget);
+    widget->setParent(this);
+
+    fContainer = widget;
 }
 
-void CarlaPluginGUI::closeEvent(QCloseEvent* const event)
+void CarlaPluginGui::removeWidget()
 {
-    carla_debug("CarlaPluginGUI::closeEvent(%p)", event);
-    CARLA_ASSERT(event != nullptr);
-
-    if (event == nullptr)
-        return;
+    CARLA_ASSERT(fContainer != nullptr);
+    carla_debug("CarlaPluginGui::removeWidget()");
 
-    if (! event->spontaneous())
-    {
-        event->ignore();
+    if (fContainer == nullptr)
         return;
-    }
 
-    if (kCallback != nullptr)
-        kCallback->guiClosedCallback();
+    fContainer->setParent(nullptr);
+    setCentralWidget(nullptr);
 
-    QMainWindow::closeEvent(event);
+    fContainer = nullptr;
 }
 
-// -------------------------------------------------------------------
-// CarlaPluginGUI
-
-#if 0
-void createUiIfNeeded(CarlaPluginGUI::Callback* const callback)
+void CarlaPluginGui::closeEvent(QCloseEvent* const event)
 {
-    if (gui != nullptr)
-        return;
-
-    gui = new CarlaPluginGUI(engine, callback);
-}
+    CARLA_ASSERT(event != nullptr);
+    carla_debug("CarlaPluginGui::closeEvent(%p)", event);
 
-void destroyUiIfNeeded()
-{
-    if (gui == nullptr)
+    if (event == nullptr)
         return;
 
-    gui->close();
-    delete gui;
-    gui = nullptr;
+    if (event->spontaneous() && kCallback != nullptr)
+        kCallback->guiClosedCallback();
+
+    QMainWindow::closeEvent(event);
 }
 
-void resizeUiLater(int width, int height)
+void CarlaPluginGui::setSizeSafeSlot(int width, int height)
 {
-    if (gui == nullptr)
-        return;
+    carla_debug("CarlaPluginGui::setSizeSafeSlot(%i, %i)", width, height);
 
-    gui->resizeLater(width, height);
+    if (fOptions.resizable)
+        resize(width, height);
+    else
+        setFixedSize(width, height);
 }
-#endif
+
+// -------------------------------------------------------------------
 
 CARLA_BACKEND_END_NAMESPACE
diff --git a/source/backend/plugin/CarlaPluginGui.hpp b/source/backend/plugin/CarlaPluginGui.hpp
new file mode 100644
index 000000000..b316156ab
--- /dev/null
+++ b/source/backend/plugin/CarlaPluginGui.hpp
@@ -0,0 +1,78 @@
+/*
+ * Carla Plugin
+ * Copyright (C) 2011-2013 Filipe Coelho <falktx@falktx.com>
+ *
+ * This program is free software; you can redistribute it and/or
+ * modify it under the terms of the GNU General Public License as
+ * published by the Free Software Foundation; either version 2 of
+ * the License, or any later version.
+ *
+ * This program is distributed in the hope that it will be useful,
+ * but WITHOUT ANY WARRANTY; without even the implied warranty of
+ * MERCHANTABILITY or FITNESS FOR A PARTICULAR PURPOSE. See the
+ * GNU General Public License for more details.
+ *
+ * For a full copy of the GNU General Public License see the GPL.txt file
+ */
+
+#ifndef __CARLA_PLUGIN_GUI_HPP__
+#define __CARLA_PLUGIN_GUI_HPP__
+
+#include "CarlaPluginInternal.hpp"
+
+#include <QtGui/QMainWindow>
+#include <QtGui/QCloseEvent>
+
+CARLA_BACKEND_START_NAMESPACE
+
+class CarlaPluginGui : public QMainWindow
+{
+    Q_OBJECT
+
+public:
+    class Callback
+    {
+    public:
+        virtual ~Callback() {}
+        virtual void guiClosedCallback() = 0;
+    };
+
+    struct Options {
+        bool parented;
+        bool resizable;
+    };
+
+    CarlaPluginGui(CarlaEngine* const engine, Callback* const callback, const Options& options);
+    ~CarlaPluginGui();
+
+    void setSize(const int width, const int height);
+
+    // Parent UIs
+    void* getContainerWinId();
+
+    // Qt UIs
+    void setWidget(QWidget* widget);
+    void removeWidget();
+
+protected:
+    void closeEvent(QCloseEvent* const event);
+
+private:
+    Callback* const kCallback;
+    QWidget* fContainer;
+    const Options fOptions;
+
+signals:
+    void setSizeSafeSignal(int, int);
+
+private slots:
+    void setSizeSafeSlot(int width, int height);
+
+#ifndef MOC_PARSING
+    CARLA_DECLARE_NON_COPYABLE_WITH_LEAK_DETECTOR(CarlaPluginGui)
+#endif
+};
+
+CARLA_BACKEND_END_NAMESPACE
+
+#endif // __CARLA_PLUGIN_GUI_HPP__
diff --git a/source/backend/plugin/CarlaPluginInternal.hpp b/source/backend/plugin/CarlaPluginInternal.hpp
index 8f0a70a9c..c0b199097 100644
--- a/source/backend/plugin/CarlaPluginInternal.hpp
+++ b/source/backend/plugin/CarlaPluginInternal.hpp
@@ -377,24 +377,12 @@ struct ExternalMidiNote {
 
 class CarlaPluginGui;
 
-class CarlaPluginGuiCallback
-{
-public:
-    virtual ~CarlaPluginGuiCallback() {}
-
-protected:
-    virtual void guiClosedCallback() = 0;
-};
-
-// -----------------------------------------------------------------------
-
 struct CarlaPluginProtectedData {
     CarlaEngine* const engine;
     CarlaEngineClient* client;
     CarlaPluginGui* gui;
 
     bool active;
-    //bool activeBefore;
     bool needsReset;
     void* lib;
 
@@ -524,7 +512,6 @@ struct CarlaPluginProtectedData {
           client(nullptr),
           gui(nullptr),
           active(false),
-          //activeBefore(false),
           needsReset(false),
           lib(nullptr),
           ctrlChannel(0),
@@ -576,11 +563,6 @@ struct CarlaPluginProtectedData {
         }
     }
 
-    // defined in CarlaPluginGui.cpp
-    void createUiIfNeeded(CarlaPluginGuiCallback* const callback);
-    void destroyUiIfNeeded();
-    void resizeUiLater(int width, int height);
-
     static CarlaEngine* getEngine(CarlaPlugin* const plugin)
     {
         return plugin->kData->engine;
diff --git a/source/backend/plugin/Makefile b/source/backend/plugin/Makefile
index 7c546eff6..18f9a088b 100644
--- a/source/backend/plugin/Makefile
+++ b/source/backend/plugin/Makefile
@@ -27,6 +27,7 @@ endif
 
 OBJS = \
 	CarlaPlugin.cpp.o \
+	CarlaPluginGui.cpp.o \
 	CarlaPluginThread.cpp.o \
 	BridgePlugin.cpp.o \
 	NativePlugin.cpp.o \
@@ -53,9 +54,12 @@ debug:
 
 # --------------------------------------------------------------
 
-%.cpp.o: %.cpp ../CarlaBackend.hpp ../CarlaEngine.hpp ../CarlaPlugin.hpp CarlaPluginInternal.hpp CarlaPluginThread.hpp
+%.cpp.o: %.cpp ../CarlaBackend.hpp ../CarlaEngine.hpp ../CarlaPlugin.hpp CarlaPluginGui.hpp CarlaPluginInternal.hpp CarlaPluginThread.hpp moc_CarlaPluginGui.cpp
 	$(CXX) $< $(BUILD_CXX_FLAGS) -c -o $@
 
+moc_%.cpp: %.hpp
+	$(MOC) $< -DMOC_PARSING -o $@
+
 $(SHARED): $(OBJS)
 	$(CXX) $^ -shared $(LINK_FLAGS) -o $@
 
diff --git a/source/backend/plugin/VstPlugin.cpp b/source/backend/plugin/VstPlugin.cpp
index 0c00b89c0..853956d55 100644
--- a/source/backend/plugin/VstPlugin.cpp
+++ b/source/backend/plugin/VstPlugin.cpp
@@ -19,6 +19,7 @@
 
 #ifdef WANT_VST
 
+#include "CarlaPluginGui.hpp"
 #include "CarlaVstUtils.hpp"
 
 //#ifdef Q_WS_X11
@@ -38,7 +39,7 @@ const unsigned int PLUGIN_WANTS_MIDI_INPUT      = 0x8000; //!< VST Plugin wants
 /**@}*/
 
 class VstPlugin : public CarlaPlugin,
-                  public CarlaPluginGuiCallback
+                  public CarlaPluginGui::Callback
 {
 public:
     VstPlugin(CarlaEngine* const engine, const unsigned short id)
@@ -360,14 +361,20 @@ public:
         {
             if (yesNo)
             {
-                kData->createUiIfNeeded(this);
+                if (kData->gui == nullptr)
+                {
+                    struct CarlaPluginGui::Options guiOptions;
+                    guiOptions.parented  = true;
+                    guiOptions.resizable = false;
+
+                    kData->gui = new CarlaPluginGui(kData->engine, this, guiOptions);
+                }
 
                 int32_t value = 0;
 #ifdef Q_WS_X11
                 //value = (intptr_t)QX11Info::display();
 #endif
-                // TODO!!
-                void* const ptr = nullptr; //kData->gui->getContainerWinId();
+                void* const ptr = kData->gui->getContainerWinId();
 
                 if (dispatcher(effEditOpen, 0, value, ptr, 0.0f) != 0)
                 {
@@ -380,18 +387,22 @@ public:
                         const int16_t width  = vstRect->right  - vstRect->left;
                         const int16_t height = vstRect->bottom - vstRect->top;
 
-                        //if (width > 0 && height > 0)
-                        //{
-                        //    kData->gui->setFixedSize(width, height);
-                        //}
+                        if (width > 0 && height > 0)
+                            kData->gui->setSize(width, height);
                     }
 
-                    //kData->gui->setWindowTitle(QString("%1 (GUI)").arg((const char*)fName).toUtf8().constData());
-                    //kData->gui->show();
+                    kData->gui->setWindowTitle(QString("%1 (GUI)").arg((const char*)fName).toUtf8().constData());
+                    kData->gui->show();
                 }
                 else
                 {
-                    kData->destroyUiIfNeeded();
+                    if (kData->gui != nullptr)
+                    {
+                        kData->gui->close();
+                        delete kData->gui;
+                        kData->gui = nullptr;
+                    }
+
                     kData->engine->callback(CALLBACK_ERROR, fId, 0, 0, 0.0f, "Plugin refused to open its own UI");
                     kData->engine->callback(CALLBACK_SHOW_GUI, fId, 0, 0, 0.0f, nullptr);
                     return;
@@ -400,7 +411,13 @@ public:
             else
             {
                 dispatcher(effEditClose, 0, 0, nullptr, 0.0f);
-                kData->destroyUiIfNeeded();
+
+                if (kData->gui != nullptr)
+                {
+                    kData->gui->close();
+                    delete kData->gui;
+                    kData->gui = nullptr;
+                }
             }
         }
 
@@ -1873,8 +1890,11 @@ protected:
             break;
 
         case audioMasterSizeWindow:
-            kData->resizeUiLater(index, value);
-            ret = 1;
+            if (kData->gui != nullptr)
+            {
+                kData->gui->setSize(index, value);
+                ret = 1;
+            }
             break;
 
         case audioMasterGetSampleRate: