diff --git a/dgl/EventHandlers.hpp b/dgl/EventHandlers.hpp
index 8d553b65..3545a2c5 100644
--- a/dgl/EventHandlers.hpp
+++ b/dgl/EventHandlers.hpp
@@ -94,7 +94,8 @@ class KnobEventHandler
 public:
     enum Orientation {
         Horizontal,
-        Vertical
+        Vertical,
+        Both
     };
 
     // NOTE hover not implemented yet
@@ -139,7 +140,7 @@ public:
     void setUsingLogScale(bool yesNo) noexcept;
 
     Orientation getOrientation() const noexcept;
-    void setOrientation(const Orientation orientation) noexcept;
+    void setOrientation(Orientation orientation) noexcept;
 
     void setCallback(Callback* callback) noexcept;
 
diff --git a/dgl/src/EventHandlers.cpp b/dgl/src/EventHandlers.cpp
index 64f81ca3..35666e42 100644
--- a/dgl/src/EventHandlers.cpp
+++ b/dgl/src/EventHandlers.cpp
@@ -402,23 +402,35 @@ struct KnobEventHandler::PrivateData {
         bool doVal = false;
         float d, value2 = 0.0f;
 
-        if (orientation == Horizontal)
+        switch (orientation)
         {
+        case Horizontal:
             if (const double movX = ev.pos.getX() - lastX)
             {
                 d      = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
                 value2 = (usingLog ? invlogscale(valueTmp) : valueTmp) + (float(maximum - minimum) / d * float(movX));
                 doVal  = true;
             }
-        }
-        else if (orientation == Vertical)
-        {
+            break;
+        case Vertical:
             if (const double movY = lastY - ev.pos.getY())
             {
                 d      = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
                 value2 = (usingLog ? invlogscale(valueTmp) : valueTmp) + (float(maximum - minimum) / d * float(movY));
                 doVal  = true;
             }
+            break;
+        case Both:
+            const double movX = ev.pos.getX() - lastX;
+            const double movY = lastY - ev.pos.getY();
+
+            if (const double mov = movX + movY)
+            {
+                d      = (ev.mod & kModifierControl) ? 2000.0f : 200.0f;
+                value2 = (usingLog ? invlogscale(valueTmp) : valueTmp) + (float(maximum - minimum) / d * float(mov));
+                doVal  = true;
+            }
+            break;
         }
 
         if (! doVal)
@@ -596,9 +608,6 @@ KnobEventHandler::Orientation KnobEventHandler::getOrientation() const noexcept
 
 void KnobEventHandler::setOrientation(const Orientation orientation) noexcept
 {
-    if (pData->orientation == orientation)
-        return;
-
     pData->orientation = orientation;
 }