public void SetNumberSelected(NumberKeyboardButton ndc)
 {
     selectedNumberDisplayable = ndc;
     selectedValue             = ndc.number;
     numberIsSelected          = true;
     ndc.SetPressed(true);
 }
 public void DeselectNumber()
 {
     if (numberIsSelected)
     {
         selectedNumberDisplayable.SetPressed(false);
         numberIsSelected          = false;
         selectedValue             = null;
         selectedNumberDisplayable = null;
     }
 }