title: "Input string was not in a correct format." Exception in WPF Datagrid
body: <p>I have a BindingListCollectionView connected to the DataContext of a datagrid. The datagrid now shows the list of items of the BindingListCollectionView.
  But when I click on the last row to add a new item. I get an "Input string was not in a correct format." exception.</p>
  
  <p>When I step with the debugger through the WpfToolkit library the exception happens in the private void MakeFullRowSelection(object dataItem, bool allowsExtendSelect, bool allowsMinimalSelect) function of the file DataGrid.cs at the line EndUpdateSelectedItems().</p>
  
  <p>Can someone suggest how to solve the issue?</p>