private void TextBox_PreviewKeyDown(object sender, KeyEventArgs e)
{
_updateTimer.Stop();
if (e.Key == Key.Enter)
{
((AbstractEntityCollectionViewModelBase)DataContext).RefreshItems();
FilterTextBox.SelectAll();
}
else if (e.Key == Key.Down)
{
MainGrid.BackgroundFocus();
}
else
{
_beforeText = FilterTextBox.Text;
_updateTimer.Start();
}
}