winapi - Simulating a radio button check command -

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i've been trying change state of radio button programatically:

sendmessage(m_hwnd, wm_command, makewparam(idc_radio1, bst_checked), (lparam)(hwnd_radio1));

why won't work?

how using bm_setcheck? http://msdn.microsoft.com/en-us/library/bb775989(vs.85).aspx


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