Title WIndow + DataGrid BUG

Question

I am using the PopUpManager to create as a pop-up a
TitleWindow which contains a DataGrid with some elements.
Whenever i select an item from the DataGrid i dispatch an
event to notify the parent application and then I remove the PopUp
like this:
<mx:DataGrid change="myFunction(event)/>
public function myFunction(event:Event):void
//Logic to dispatch a custom event
PopUpManager.removePopUp(this);
The thing is this is causing an error in the Flex SDK
classes, the error says:
TypeError: Error #1009: Cannot access a property or method of
a null object reference
at
mx.controls.listClasses::ListBase/::mouseIsUp():[ListBase.as:7029]
at
mx.controls.listClasses::ListBase/mx.controls.listClasses:ListBase::mouseUpHandler():[Lis tBase.as:7060]
at
mx.controls::DataGrid/mx.controls:DataGrid::mouseUpHandler():[DataGrid.as:4211]
So what's the deal here??? I am removing the popUp on the
change event of the DataGrid and it fails, why is that?
If i change it so the change event only dispatches the event
and then I manually close the popup using the close button then it
works, but it doesn't work when i try to close the PopUp from the
change event of the DataGrid.
Any ideas? is it a bug?

Answer 1

This is what the DataGrid tries to do after the popUp is
closed:
TypeError: Error #1009: Cannot access a property or method of
a null object reference
at
mx.controls.listClasses::ListBase/::mouseIsUp():[ListBase.as:7029]
at
mx.controls.listClasses::ListBase/mx.controls.listClasses:ListBase::mouseUpHandler():[Lis tBase.as:7060]
at
mx.controls::DataGrid/mx.controls:DataGrid::mouseUpHandler():[DataGrid.as:4211]
This didn't happen in Flex 2.0, which makes me believe it is
a Flex 2.0.1 bug, and i hope Adobe can solve it (it worked before)
for a next update.
It seems that the workaround will be to delay the call to
RemovePopUp as you mention, either by using a timer or by using the
CallLater( ) method.
I would like to know if Adobe has a better workaround and if
they are aware of this bug