Do exist any function to close WNDCLASS box or press some button inside?

[Pranciskus]

Does exist any function to close WNDCLASS box or press some button inside?

[E0p9LyTq]

DestroyWindow function (Windows)
https://msdn.microsoft.com/en-us/library/windows/desktop/ms632682(v=vs.85).aspx

or

post a WM_CLOSE to the app's message queue with
SendMessage function (Windows)
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644950(v=vs.85).aspx
or
PostMessage
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644944(v=vs.85).aspx
or
SendMessageCallback
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644951(v=vs.85).aspx
or
SendNotifyMessage
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644953(v=vs.85).aspx
or
PostThreadMessage
https://msdn.microsoft.com/en-us/library/windows/desktop/ms644946(v=vs.85).aspx

The Win32 API is WELL documented at the Microsoft Developer Network
http://msdn.microsoft.com/