1. frames respect update region (Tom Surace patch)

2. bitmap buttons don't lose bitmaps
3. attempt to reduce number of simultaneously default buttons in a panel


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@3089 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/frame.cpp

@@ -878,10 +878,7 @@ bool wxFrame::HandlePaint()
         }
         else
         {
-            wxPaintEvent event(m_windowId);
-            event.m_eventObject = this;
-
-            return GetEventHandler()->ProcessEvent(event);
+            return wxWindow::HandlePaint();
         }
     }
     else