More ActiveX control questions

Hi,
I'm working on my first ActiveX control. It's a windowless control and paints directly to container's HDC. I have a simple question:

When I want my control to be invisible, I basicly just do nothing in OnDraw or OnDrawAdvanced handlers, right ?
If so, when it goes from visible to invisible, I want to  invalidate the control RECT in the control container window, so that it can repaint this region. Do I have to use IConnectionPoint and IAdviceSink for this ? I think the easiest way is to get the container's HWND and call InvalidateRect(). How do I get this HWND ?
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byangAsked:
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chensuCommented:
Call COleControl::InvalidateControl().
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byangAuthor Commented:
I'm using ATL, and COleControl is an MFC thing.
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chensuCommented:
You should have indicated you are using ATL.

For ATL, call CComControl::FireViewChange().
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