Vadim Zeitlin 7653edb34d Avoid blank alpha and graphics screens in the drawing sample. ...

It was confusing to not see anything when selecting one of the screens using
wxGraphicsRenderer if a renderer hadn't been selected from the menu before.

Switch to using wxGC automatically now if one of these screens selected and
there was no previously selected renderer.

2015-03-08 16:28:22 +01:00

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