Hello there

I'm trying to expand all Rows programmatically which _usually_ works with the following code:

var filterViewModels = PivotGrid.DataSource.Rows.Where(fvm => fvm is IFilterViewModel).ToList();

for (int i = 0; i < filterViewModels.Count; i++)
{
var filterViewModel = filterViewModels[i] as IFilterViewModel;
if (i == filterViewModels.Count - 1)
{
((DataSourceBase)PivotGrid.DataSource).ExpandToLevelAsync(filterViewModel, filterViewModel.Hierarchy.Levels.Count - 1).ContinueWith(
(t) => PivotGrid.DataSource.RefreshGrid(), TaskContinuationOptions.ExecuteSynchronously);
}
else
{
((DataSourceBase)PivotGrid.DataSource).ExpandToLevelAsync(filterViewModel, filterViewModel.Hierarchy.Levels.Count - 1);
}
}

##################

I used the word usually because in certain environments my application hangs on "PivotGrid.DataSource.RefreshGrid()" (hangs means doesn't respond to anything while having 0% CPU usage)

This occurs on 2 PCs with the same configuration: 

HP Compaq Elite 8300 SFF

Intel Core i5-3570
Win 7 32 bit

This Error occurs only when i try to expand all rows programmatically (using the "+"-indicators of the UI works as expected),

expanding single Nodes by Code (eg. when restoring a previous saved state of the grid) works flawlessly.

Does anyone have an Idea how to fix/avoid this? I really need this functionality...

BR