Override remove in PopupHelper.ScalableRootFigure #814

As this class is managing its children differently all methods
manipulating and accessing children from the outside need to be
overriden. remove() was missing resulting in acceptions.

Fixes: #814

Author: azoitl

org.eclipse.draw2d/src/org/eclipse/draw2d/PopUpHelper.java

@@ -281,6 +281,12 @@ public double getScale() {
 			public void setScale(double scale) {
 				scalablePane.setScale(scale);
 			}
+
+			@Override
+			public void remove(IFigure figure) {
+				scalablePane.remove(figure);
+			}
+
 		}
 	}
 }