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The more I dig into this, the more that I think there may not be a way around this behavior. Somehow the lack of a title bar is preventing the WM_SIZE message from being received in my custom form's WndProc. I tried a regular winforms app with the standard title bar and buttons, and it receives the WM_SIZE message as expected when Windows + M is pressed. I've checked out the messages that my app is receiving with Spy++ (thanks again SLaks) and it looks like the WM_SIZE message is not getting sent to my app.

Or, more likely, I'm not intercepting them properly. This seems like the right approach (thanks to SLaks), but my app doesn't seem to be receiving any messages from Windows + M. Me.WindowState = FormWindowState.Minimized Protected Overrides Sub WndProc(ByRef m As ) I've tried implementing the following code, with no success. How can I detect Windows + M, especially if my app is not active, or how can I duplicate the functionality of the built-in Minimize button? It seems that the lack of the built-in minimize button on the form causes my app to ignore Windows + M.

But, if I use the Windows + M shortcut, all the programs EXCEPT mine minimize. If I have my app running, and I click the 'Show Desktop' shortcut, all the programs minimize properly, including mine. I've created custom controls to replace those.

I am using a form with a completely custom look, so there is no title bar, thus no minimize, maximize, and close buttons. I have a simple winforms application in VB.NET 2008.