two-step frame construction

wxPython Users
1

Hi!

I have an MDI child frame, that I center on screen:

class child(wxMDIChildFrame):
    def __init__(self, parent):
        wxMDIChildFrame.__init__(self, parent=parent, id=110, title='Title')
        self.panel= childPanel(self)

        self.CenterOnParent(wxBOTH)

class childPanel(wxPanel):
    ...

The problem is:
The window is appear somewhere the system position it,
then hide, and appear once again in the center.

I want the window appear only once in the center.
Maybe two-step frame construction is the solution with Create,
but I don't know how to use it.

Can you give an example?

Thanks:
Norbert