/// <summary>
/// To create a new ROI object the application class initializes a
/// 'seed' ROI instance and passes it to the ROICtrller.
/// The ROICtrller now responds by manipulating this new ROI instance.
/// </summary>
/// <param name="r">
/// 'Seed' ROI object forwarded by the application forms class.</param>
public void SetROIShape(ROI r)
{
_ROIMode = r;
_ROIMode.SetROISign(_signROI);
}