1. wxMDIParentFrame::~wxMDIParentFrame() bug fixed

2. tooltips work with wxRadioBox
3. duplicated OnCtlColor()s moved to wxControl


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@4693 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/mdi.cpp

@@ -213,6 +213,9 @@ wxMDIParentFrame::~wxMDIParentFrame()
 {
     DestroyChildren();
 
+    // already delete by DestroyChildren()
+    m_frameToolBar = NULL;
+
     ::DestroyMenu((HMENU)m_windowMenu);
     m_windowMenu = 0;