I've found that adding a lot of rows (1000+) to an AdvancedDataGrid can be quite slow, if the rows happen to be visible (in an open node of the tree). I don't know why this is the case, especially since it's not the case in a regular DataGrid, but I'd like to work around it.
So how can I tell the AdvancedDataGrid to temporarily ignore updates to the dataProvider? Once the large number of rows have been added, I'll turn the automatic updating back on, for the slow trickle of updates that come after that.