GtkDrawingArea initialization

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How do I get a GtkDrawingArea to show some initial drawings when the GUI starts...??? Specifically, I want a 2x2 rectangle pre-drawn at the center of the DrawingArea so that when the program starts, you can immediately see this center point... The problem is, I have inserted the drawing code in several places I think it would work (in a constructor -- using gtkmm), but when I run my program, the rectangle does not show up... Please help...

	- Ian

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