private void RemoveChipItem(object sender, ChipItemEventArgs e)
 {
     if (DataContext is Sample sample)
     {
         if (sample.Data is TestCollections test)
         {
             test.RemoveChipItem(e.Item as TestCollections.SelectableData);
         }
     }
 }
 private void RemoveChipItem(object sender, ChipItemEventArgs e)
 {
     MutableTestCollection.Remove(e.Item as SelectableData);
 }