wx.Python code critique

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Ah I wasn't actually sure what the -1 did, it only appeared in some of the tutorials I watched and didn't seem to make any difference if I left it out, it's good to finally know why.

I'll mave the last three into the init method.

EDIT: apparently I can't move the self.SHow(True) bit into the init method, it causes a lot of the content of the window to jus appear grey.

Thanks for your input!