private void DebugButton_Click(object sender, RoutedEventArgs e)
 {
     TaskListBox.UnselectAll();
     DoingBox.UnselectAll();
     DoneBox.UnselectAll();
     MessageBox.Show("All tasks unselected");
 }
 private void DoneBox_LostFocus(object sender, RoutedEventArgs e)
 {
     DoneBox.UnselectAll();
 }