Added some comments to DrawabkeComposite.

modules/juce_gui_basics/drawables/juce_DrawableComposite.h

@@ -30,6 +30,11 @@
 /**
     A drawable object which acts as a container for a set of other Drawables.
 
+    Note that although this is a Component, it takes ownership of its child components
+    and will delete them, so that you can use it as a self-contained graphic object.
+    The intention is that you should not add your own components to it, only add other
+    Drawable objects.
+
     @see Drawable
 */
 class JUCE_API  DrawableComposite  : public Drawable