[win32api] Checkbox help

how do I check if the checkbox is checked and how do I force it to check/uncheck?
To check send the checkbox or radio button BM_GETCHECK message and check return value:
http://msdn.microsoft.com/en-us/library/bb775986(VS.85).aspx

To force checking/unchecking send BM_SETCHECK message:
http://msdn.microsoft.com/en-us/library/bb775989(v=vs.85).aspx
thanks!
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