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XamDataGrid SelectedItems binding slowing down SelectAll Records


I have added a SelectedItems behaviour to my XamDataGrid in order to bind the SelectedItems to my view model. However I am now trying to select all the records using Ctrl+End/Ctrl+A. The binding slows the selection using these methods (guessing the SelectedItems event is firing once per items in the list), removing the binding resolves the issue. Is there a way to only fire the SelectedItems event this once when all the items have been selected?