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Asked: 2026-05-11T10:30:19+00:00

I have a control, VideoControl, which displays video using DirectShow – it’s set as

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I have a control, VideoControl, which displays video using DirectShow – it’s set as the owner of an IVideoWindow. I have another control, AreaControl, which is supposed to show a dashed rectangle over the video control. AreaControl is set to be transparent using SetStyle(ControlStyles.SupportsTransparentBackColor, true). If I place AreaControl over any other control, it works as expected, showing a dashed rectangle over the controls behind it. But when I place the dashed rectangle control over the video control, the AreaControl is filled in with the VideoControl’s BackColor.

What do I need to do to get the video to display through the AreaControl, with the dashed rectangle overlaid on it? Is there a way to get the VideoControl to paint itself with the video, rather than just drawing its BackColor?

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1 Answer

  1. In the end the answer to this turned out to be to use the AreaControl’s Region property, since we didn’t need partial transparency.

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