I have a configuration which works in the following way
1) There's a button on Applet 1, which will pop-up Applet 2 using the ShowPopup method.
2) In Applet 2, there's a field which has MVG applet.
I observed the following behaviour:
1) Click buttons on Applet 1 which pops-up Applet 2.
2) In Applet 2, click the MVG pick which pops-up the MVG applet.
3) Close the MVG applet by clicking the X button on the browser window.
4) When the MVG applet closes, it also auto-close Applet 2. Focus return to Applet 1.
The expected behaviour is MVG applet close, and focus should return to Applet 2, not auto-close Applet 2.