As the title says, for Canvases, color or bitmap defined in the Designer has no effect.
Their default background is transparent and remains.
We need to draw those by code.
Attached a small test program.
Uncommenting these two lines shows what I expected.
' Canvas1.DrawImage(img1, 0, 0, Canvas1.Width, Canvas1.Height)
' Canvas2.DrawRect(0, 0, Canvas2.Width, Canvas2.Height, fx.Colors.Blue, True, 1)
Their default background is transparent and remains.
We need to draw those by code.
Attached a small test program.
Uncommenting these two lines shows what I expected.
' Canvas1.DrawImage(img1, 0, 0, Canvas1.Width, Canvas1.Height)
' Canvas2.DrawRect(0, 0, Canvas2.Width, Canvas2.Height, fx.Colors.Blue, True, 1)