internal override void Reset(bool toolReset)
{
base.Reset(toolReset);
if (ArcMap.Document == null || ArcMap.Document.FocusMap == null)
return;
// reset surface names OC
ResetSurfaceNames(ArcMap.Document.FocusMap);
// reset observer points
ObserverAddInPoints.Clear();
ClearTempGraphics();
}