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    <p>The answer to your question is that you cannot.</p> <p>But a workaround, to give you a transparent section in your form, would be to add the <code>WS_EX_LAYERED</code> extended window style to your form. Then you can tell the Window Manager that you want to use a chroma-color key to make part of your form transparent:</p> <pre><code>SetLayeredWindowAttributes( Form.Handle, // __in HWND hwnd, RGB(0, 255, 0), //green is the color key __in COLORREF crKey, 255, //window is opaque otherwise __in BYTE bAlpha, LWA_COLORKEY //use color-key (rather than per-pixel alpha) __in DWORD dwFlags ); </code></pre> <p>Then you can put your "transparent" area as lime green:</p> <p><img src="https://i.stack.imgur.com/sXu6k.jpg" alt="enter image description here"></p> <p>Which then at runtime will be transparent:</p> <p><img src="https://i.stack.imgur.com/57yB5.jpg" alt="enter image description here"></p> <hr> <p><strong>Update:</strong> When i use layered window to have full transparency mouse events <em>do</em> trickle through to what's underneath. Notice the "flag" icon highlight:</p> <p><img src="https://i.stack.imgur.com/tjlzf.jpg" alt="enter image description here"></p> <h1>See also</h1> <ul> <li><a href="http://msdn.microsoft.com/en-us/library/ms632599%28v=vs.85%29.aspx#layered" rel="nofollow noreferrer">Window Overview -> Window Features -> Layered Windows</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ms633540%28v=vs.85%29.aspx" rel="nofollow noreferrer">SetLayeredWindowAttributes Function</a></li> <li><a href="http://msdn.microsoft.com/en-us/library/ff700543%28v=vs.85%29.aspx" rel="nofollow noreferrer">Extended Window Styles</a></li> <li><a href="http://Layered%20Windows" rel="nofollow noreferrer">Layered Windows</a></li> </ul>
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    1. CO+1 - this is what I'm doing at the moment :) The problem is that mouse events don't bleed through unless you apply WS_EX_TRANSPARENT and that effects the entire window
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    2. COP.S. The fact that mouse events don't bleed through appears to be a Windows 7 / Vista bug: http://social.msdn.microsoft.com/Forums/en/winforms/thread/3fbfb0cc-23d4-4677-b2d6-eb0892def313
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    3. COMouse events were bleeding through for me....Windows 7 64-bit.
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