/// <summary> Initialises this object. </summary>
 ///
 /// <param name="prompt"> The prompt. </param>
 /// <param name="mask">   The mask. </param>
 ///
 /// <returns> A Geometry. </returns>
 private static Geometry AskUser(string prompt, GeometryMask mask)
 {
     return(SelectionManager.AskForGeometry(prompt, mask));
 }