/// <summary>
/// Creates a new controller window, or active the existing one.
/// </summary>
public static void create()
{
if (theInstance == null)
{
theInstance = new VarHeightBuildingController();
}
theInstance.Show();
theInstance.Activate();
}
protected override void OnClosing(CancelEventArgs e)
{
base.OnClosing(e);
theInstance = null;
}