How to get the current state of a StateButtonTool of UltraToolbarsManager inside the tool Click event

Here is my code.

 private void ultraToolbarsManager1_ToolClick(object sender, Infragistics.Win.UltraWinToolbars.ToolClickEventArgs e)
        {
            switch (e.Tool.Key)
            {

           case "Grouping": 

     {

         // Here I need to write the code and it has to work only  if the StateButton is on active state

     }

}

Help me on this.

Thanks in advance.

Kishor Kodakkatil