attaching an unknown control like wxglcanvas

[Eric]

It doesn't not have to be wxglcanvas control.  The following code also
places the control in this case a button in the top left hand corner
over other controls.  It is clearly not suppose to be there based on
what XRCed is showing me, and I do get a pink box where the contol
should be when I don't call AttachUnknonwControl.  How do I make my
unknown control obey the sizers it is suppose to be in based on the xrc
file?

 MainFrame::MainFrame(){
     wxXmlResource::Get()->LoadFrame(this, NULL, "mainFrame");
     SetMenuBar(wxXmlResource::Get()->LoadMenuBar("mainMenu"));
     wxButton* navigator;
     navigator = new wxButton(this, -1);
     wxXmlResource::Get()->AttachUnknownControl("navigator",
navigator);
}