MessageBox stops program flow

I have two applications.
When i send a BM_CLICK message from A to B, it opens a MessageBox on B.

My issue is that it stops the program flow in A.
I have to close the MessageBox on B in order to continue the program flow on A.

Is this something normal?
How to avoid this?

Yes. A MessageBox is a modal window, and the returnvalue from the function indicates what button you have pressed to close the messagebox. So this is entirely normal.

Edit: Did not properly read the question I see, although looks like my information is somewhat related to the issue anyway, but not entirely..

I'm guessing you are using SendMessage()?

Quote:

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Originally Posted by MSDN

SendMessage Function
Sends the specified message to a window or windows. The SendMessage function calls the window procedure for the specified window and does not return until the window procedure has processed the message.

PostMessage Function
Places (posts) a message in the message queue associated with the thread that created the specified window and returns without waiting for the thread to process the message.

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@_Mike
Yes i was using SendMessage().
I never would have thought it was that easy, thanks a million, you made my day! :)

@Shakti
Thanks for your response.
I guess you have learned something too with Mike's answer. :)