private void ResizeMe()
{
// Tree or scale changed. Update control size to fit.
if (_boxen == null)
{
return;
}
var newSize = _boxen.getBounds();
// NOTE side-effect: control is invalidated from resize BUG except when size doesn't change!
this.Size = new System.Drawing.Size
((int)((newSize.Width + 2 * _margin) * _zoom),
(int)((newSize.Height + 2 * _margin) * _zoom));
Invalidate();
}