Detecting mouse buttons in .NET

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This is embarrassingly stupid - I'll be realistic and assume that I'm the stupid one here:

When developing with Winforms, most events allow checking the state of the mousebuttons using the MouseButtons enum.  However I can't seem to catch combinations - for example, if the user presser both the right and middle button at once, I want to handle it differently than a standard right-click.  Why? Don't ask - its a long story.

Anyhow, the enum does not include combinatations, and even trying various ANDs I haven't been able to detect this. Ideas anyone?