Thread: Help me with PostMessage to send ALT+Key

I have try many way but nothing happen, look some of my code below:

PostMessage (windowHandle, WM_SYSKEYDOWN , VK_MENU, 1);
PostMessage (windowHandle, WM_KEYDOWN, 0x33, 0 );
PostMessage (windowHandle, WM_KEYUP, 0x33, 0 );
PostMessage (windowHandle, WM_SYSKEYUP, VK_MENU, 0 );


I want to send ALT+3 to the handle.
Someone can help me pls. Thank you