protected virtual void Dispose(bool disposing)
 {
     if (disposing)
     {
         _drawableContainer?.Dispose();
     }
     _drawableContainer = null;
 }
 protected virtual void Dispose(bool disposing)
 {
     if (disposing)
     {
         if (drawableContainer != null)
         {
             drawableContainer.Dispose();
             drawableContainer = null;
         }
     }
 }