private void RectangleSelectionChanging(object sender, RecangleSelectionEventArgs e)
{
_TargetList.SelectedItems.Clear();
VisualTreeHelper.HitTest(_TargetList, ItemHitTestFilter, ItemHitTestCallback, new GeometryHitTestParameters(new RectangleGeometry(e.SelectionRect)));
}
private void RectangleSelectionStarted(object sender, RecangleSelectionEventArgs e)
{
_TargetList.Focus();
}