1. fixed bug with MDI child frames changign state when parent frame was

iconized/uniconized
2. multiple selection emulation for wxTreeCtrl almost done


git-svn-id: https://svn.wxwidgets.org/svn/wx/wxWidgets/trunk@6343 c3d73ce0-8a6f-49c7-b76d-6d57e0e08775

src/msw/frame.cpp

@@ -805,9 +805,12 @@ void wxFrame::IconizeChildFrames(bool bIconize)
     {
         wxWindow *win = node->GetData();
 
-        if ( win->IsKindOf(CLASSINFO(wxFrame)) )
+        // the child MDI frames are a special case and should not be touched by
+        // the parent frame - instead, they are managed by the user
+        wxFrame *frame = wxDynamicCast(win, wxFrame);
+        if ( frame && !wxDynamicCast(frame, wxMDIChildFrame) )
         {
-            ((wxFrame *)win)->Iconize(bIconize);
+            frame->Iconize(bIconize);
         }
     }
 }