wxPython DnD stops working after SetSizeHints

[Emiliano Molina]

This has been driving me crazy for a couple of days and I have finally 
narrowed it down to the following code.  If the commented section is 
uncommented the drag and drop handler is never called.  I have included 
the .xrc file for reference.

Any help is greatly appreciated. An explanation would be great, but at 
the moment I would be eternally grateful for a workaround!

Thanks in advance for those of you that spend some time helping out.

Here is the blasted code,

from wxPython.wx import *
from wxPython.xrc import *

class TestFrame(wxFrame):
     def __init__(self,parent,ID):
         wxFrame.__init__(self,parent,ID,"test 
frame",(100,30),(70,60),wxDEFAULT_FRAME_STYLE)
         self.panel=wxPanel(self,-1)

class FileDropTarget(wxFileDropTarget):
     def __init__(self, window):
         wxFileDropTarget.__init__(self)

     def OnDropFiles(self, x, y, filenames):
         print filenames

class App(wxApp):
     def OnInit(self):

         self.res=wxXmlResource("test.xrc")
         self.frame=self.res.LoadFrame(None,"FRAME1")
         self.frame.panel=XRCCTRL(self.frame,"test_list")

         dt=FileDropTarget(self.frame)
         self.frame.panel.SetDropTarget(dt)

# The following lines break the drag and drop
#         self.panel=XRCCTRL(self.frame,"panel")
#         sizer=self.panel.GetSizer()
#         sizer.SetSizeHints(self.frame)

         self.frame.Show()
         self.SetTopWindow(self.frame)

         return True


def main():
     app=App(0)
     app.MainLoop()


if __name__=="__main__":
     main()


and here the XRC

<?xml version="1.0" ?>
<resource>
   <object class="wxFrame" name="FRAME1">
     <title></title>
     <object class="wxPanel" name="panel">
       <size>100,100</size>
       <object class="wxBoxSizer">
         <orient>wxVERTICAL</orient>
         <object class="sizeritem">
           <object class="wxStaticBoxSizer">
             <label>test_list</label>
             <orient>wxVERTICAL</orient>
             <object class="sizeritem">
               <object class="wxListBox" name="test_list">
                 <content/>
               </object>
             </object>
           </object>
         </object>
       </object>
     </object>
     <size>100,100</size>
   </object>
</resource>