Thanks for your replies.
First I am explaining my requirement :-
I created my own minimize and maximize button in my Application.
When I click on minimize button, my application should minimize like
our application
(If we minimize any application in our PC, that application is
displaying in our taskbar)
I want my application should display in taskbar after minimize.
I know how to resize the application to its minimum size.
But resize is not ful filling my requirement.
http://www.kirupa.com/forum/showthread.php?t=231267
Basically, you can’t do it. Window.blur() might do what you need, though.