[flexcoders] Show progress on Progressbar

[markgoldin_2000]

I am building complex dataGrids, about 20. I would want to show some 
progress of a building process on a Progressbar. But I can't find a way 
of the Progressbar's continious update.
Here is some code:
<mx:ProgressBar id="loadingProgress" mode="manual" label="Loading 
Model ... Please wait"/>

and the update after the next dataGrid is being built:
mainApp.loadingProgress.setProgress(totalProgress, 100);
where totalProgress is just a value to test. But I dont see any change 
on the Progressbar. Any idea?

Thanks