public void GotoPosition(TextPosition position)
 {
     this.textPosition.Row    = position.Row;
     this.textPosition.Column = position.Column;
 }
 public void ScrollWindow(TextPosition upperLeft, TextPosition lowerRight, byte attrib)
 {
     this.ScrollText(upperLeft, lowerRight, 1, attrib);
     upperLeft.Row = lowerRight.Row;
     this.GotoPosition(upperLeft);
 }