A single UIHandle can define multiple rotation states

src/UIHandle.cpp

@@ -15,10 +15,20 @@ UIHandle::~UIHandle()
 {
 }
 
-void UIHandle::Enter()
+void UIHandle::Enter(bool)
 {
 }
 
+bool UIHandle::HasRotation() const
+{
+   return false;
+}
+
+bool UIHandle::Rotate(bool)
+{
+   return false;
+}
+
 void UIHandle::DrawExtras
    (DrawingPass, wxDC *, const wxRegion &, const wxRect &)
 {