Hi thanks for the repliy . Can you explain little detail.
Also i have noticed that in popupbutton.as code they have
registered for a listener Event.REMOVED_FROM_STAGE, while i am
resizing window this event got called and causing the problem.
I did some analysis regarding this issue and got some idea.
At first we are launching the application its creating a
DisplayContainer for the root. Each and every element added to this
becomes child of this container .
Once i am resizing the window if scroll bar nedded the
environment is creating a different DisplayContainer , menu is not
added in the
new DisplayContainer .