Sets the background style of the window. The background style indicates whether background colour should be determined by the system (wxBG_STYLE_SYS TEM), be set to a specific colour (wxBG_STYLE_COL OUR), or should be left to the application to implement (wxBG_STYLE_CUS TOM).
On GTK+, use of wxBG_STYLE_CUST OM allows the flicker-free drawing of a custom background, such as a tiled bitmap. Currently the style has no effect on other platforms.
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