public void AddButton(RadioButton rb)
 {
     if (rb != null && !Children.Contains(rb))
     {
         Children.Add(rb);
         rb.IsCheckedChanged += new PropertyChangedEventHandler(RadioButton_CheckedChanged);
         rb.SetMargin(margin);
     }
 }
 public void RemoveButton(RadioButton rb)
 {
     if (rb != null && Children.Contains(rb))
         Children.Remove(rb);
 }