private static void listBox_MouseLeftButtonUp(object sender, MouseButtonEventArgs e)
{
// notify the helper class that the list box has terminated the drag click
DragSelectionHelper.SetIsDragClickStarted(DragSelectionHelper.ListBox, false);
}
private static void listBox_PreviewMouseLeftButtonDown(object sender, MouseButtonEventArgs e)
{
// notify the helper class that the listbox has initiated the drag click
DragSelectionHelper.SetIsDragClickStarted(DragSelectionHelper.ListBox, true);
}