Mono GUI Application is going to hang after moving tab from one window to another window

Mono GUI Application is going to hang after moving tab from one window to
another window

I have Ubuntu 12.04 and mono 2.10.8 in my Linux PC.
I am running one .NET binary using mono on my Linux platform PC and it is
working fine on process startup.
But when i moved my running GUI window to another window and get back to
that windows at that time , My GUI Application goes into the hang state
because i can not press any button on My GUI window.
I have also used all the optimization option step by step while running
.NET binary using mono but still causes the GUI hang issue.
I have debug my .NET binary with some debugging options and found that
whenever GUI window application goes into stuck condition at that GDIplus
library code is running. so, it seems that there is something is going
wrong into the GDIplus library.
does any one have idea what is happening here or any one have faced this
issue before?
Please let me know if anyone need any more information and give valuable
feedback as sson as possible.