Splitter Contro Focus Bug (Problem)

Hello guys, I found a bug in the .net Splitter control:
Open any other application, alongwith the following sample if u wanna
test it.
In any Windows form application, use the splitter e.g., to split a tree
view control (on the left) and rich text box(on the right of splitter).
Now left mouse Click on the splitter and hold down your mouse ,now at
the same time press Alt+Tab on the key board, and go to the other
application you have opened along with this sample.Now you can leave
your mouse, and again come to the sample application, click in the rich
text box and try to enter any text you will see that nothing will be
typed, the problem is the focus has been frozen to the splitter, to
verfiy it move the mouse around the splitter closely you will see the
splitter shadow alongwith the splitter,although pressing the escape
key can solve the problem.But this problem should not exist at all. :mad:

Note: I have given the example with the Richtextbox, but it is true for
some other input control e.g., text box etc.
Any body who can help me out of this problem (without the need to
escape) will be highly appreciated.

Thanks in Advance
A.R. Qureshi.