I got it.
I did the following settings and got it worked. From config.fpw I removed SCREEN = OFF statement. I set Main form’s AOT to .F. and in the activate event set _SCREEN.VISIBLE = .F. Then in the program, where I want to activate another window, I set the VISIBLE property of _SCREEN to .T.
I am sure, there must be some better and proper way of doing this. There might be some other side effects of this method, which I don’t know yet. If I come across any, I will definitely put them here. Meanwhile any suggestions are welcome.

Yashodhan