how to install Message pop up in a second thread

[Ehsan]

I have an multithreaded application. I am trying to pop-up an error message while i'm inside a thread (other than the main thread that gui runs in). I use MessagePopup in the User Interface library. However, the new popup message is not over the other windows. Meaning it is in a different thread, hence the main window is not dimed and can be accesses. How can I get around this?
thanks so much

[RobertoBozzolo]

You could use PostDeferredCallToThread to launch a callback in the user interface thread.
The deferred callback can issue the popup message you need.

Roberto