how to remove focus of notification form similar to outlook email notification

Hi All,
I am implementing a notification form similar to outlook email notification.
my application call this notification form from a dll. this dll includes a form class and this dll has some object value to display the contents on form.

i am filling the form with the object before "form.show."
form has some timer to implement hide and fading.
my problem is when ever form is showing, the focus goes to form from current application(any) and notification form will hide after few seconds.once form closed, the focus coming back to current application.
I dont want the focus goes to form until user clicks form with mouse.

How to solve this.

I appreciate for your time.

vsr