This is the proof, after you push any keyboard, "WINAPI _tWinMain" is called.
https://github.com/WaitrudWeber/source_zip/blob/master/20180517.zip
I created button controller in WM_CREATE in Wnd_Prc which is the main window procedure, but it is prototype.
Anyway, I pleasure if you download the below.
https://github.com/WaitrudWeber/source_zip/blob/master/20180517-2nd.zip
Plese reffer to the below for compilation.
https://waitrudweber.hatenablog.com/entry/2018/05/01/005938
