Shadow of Closed form

[sameer]

Hi,
My application is using VS2003 , VB.Net with Sql server 2000. The
application has an MDI environment with several MDI child forms in the main
MDI form. I use Devexpress Grids ( a third party control) on all the forms.
At times , just at times due to dont know why, when i close one of
the child forms it closes down but leaves a shadow of itself on the MDI form
..
I have the menu options for selecting other forms up in the top part of the
MDI form. Only this part does not have the shadow of the closed child form,
might be because the closed child form was not overlapping the menuoptions.
Now with my application running and having a shadow of the previously closed
form when i go to any other application on my machine and then go back to the
VB.Net application, it now has the shadow of the other application. this is a
very strange behavior and i dont know why it is happening. Can any body give
me any hints or clue to this, i am pretty sure many of you out there have had
this problem.
thanks in Advance.
Please help!
Sameer