ExpandoTextCtrl that eventually gets scrollbars?

Has anyone been able to modify expandoTextCtrl (wx.lib.expando.ExpandoTextCtrl) to show scrollbars when it becomes taller than the max
height? (as set by SetMaxHeight() )

By just changing the style to not have wx.TE_NO_VSCROLL in the expando code, I can get it to do it but there is a small visual glitch where the blue (not greyed out) scroll bar appears very briefly with each new line until it’s past max height. (at least seen on Windows XP and wxPython 2.8.12 or 2.9.5).

I would think that a nice improvement to the expando would be clean scrollbars after max height, but can’t get it to work well yet, so if anyone has, I’d be glad to know how to do it.

Thanks,

Che