AIR Application enabled=false not processed (Busyindicator)

Question

In my AIR application (with mate-Framework) i did follwing things:

1. click on a button
2. call a method in my model "onApplicationBusy"
3. apply some filter in arraycollections.

In my onApplicationBusy there is this code:

FlexGlobals.topLevelApplication.enabled = false;
FlexGlobals.topLevelApplication.

I trace every step and all methods are called in right order. But my application never becomes disabled.

Why. Is there a method for this purpose.

I try InvalidateDisplayList or ValidateNow or callLater. But all tries won't work. Probably i try it on the wrong place?

I assume, my application is so busy while applying filters (4 values for 10.000 lines) that the disabled property can't processed.

If i call the method without applying the filters all works fine. If i call just the disbaled property but never enable the app again, the app will shown as disabled after applying the filters. for me too late.

What i origin want is a clear behavior, when the app is busy and when not (ready for clicking on buttons and all this stuff).

If you can help me or know a method, how can i shown a busy application, please help me Thanks Frank