internal override void OnActivateTool(object obj)
{
var mode = obj.ToString();
ToolMode = MapPointToolMode.Unknown;
if (string.IsNullOrWhiteSpace(mode))
return;
if (mode == VisibilityLibrary.Properties.Resources.ToolModeObserver)
ToolMode = MapPointToolMode.Observer;
else if (mode == VisibilityLibrary.Properties.Resources.ToolModeTarget)
ToolMode = MapPointToolMode.Target;
base.OnActivateTool(obj);
}