Thanks for everyone for helping to build a program in Win with Glade.
The user interface works, but USB or serial communication is needed in the program. 
I am confused how WinAPI functions should be called in the c language, since they are written in c++ ?

Is it possible to call c++ program from the glade user interface, for example send a string into port from text entry when user press button?
Is there a c++ wrapper  for a glade under MinGW?
I found very useful examples, actually written serial library with WinAPI
Sincerely Yours,