Using a wxPanel subclass

Hi everyone!

Is it possible to tell wxGlade to use a custom class instead of wxPanel? 
I've tried changing the "Class" field but wxGlade generates a new file 
with the class definition... I just want something like

from mystandardpanels import MyCustomPanel
self.pnl_main = MyCustomPanel(self, wx.ID_ANY)

instead of

self.pnl_main = wx.Panel(self, wx.ID_ANY)

with MyCustomPanel being a class that already exists.

Thanks for your help!

(wxGlade 0.7.2)

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