public class ItemCall
         implements Serializable
     {
         String i_key;
         public void onToggle(ActionEvent ae)
         {
             // check if this item can be toggled: items
             // that do not provide a text cannot be toggled
             String s = getK().get(i_key);
             if (s == null || s.equals(""))
             {
                 if (m_pivotList.getDelegeateToggleToUpperNode() == true)
                 {
                     FIXGRIDPivotItem prevItem = findPivotItemBeforeWithFilledKey(i_key);
                     if (prevItem != null)
                         prevItem.togglePivot(i_key);
                 }
             }
             else
             {
                 // toggle!
                 togglePivot(i_key);
             }
         }
     }
 

     /**
      * The pivot grid arranges its contained nodes as "kind of tree". If the user clicks within the
      * key area into an empty area then by default the click is delegeated to the next node level,
      * that manages this part of the tree. Consequence: if the user clicks into an empty area
      * then the pivot-tree is shrinked/closed within this area. - By passing "false" as parameter
      * you define that no explicit action is taken if the user clicks into an empty area. This means
      * the user only can open/close tree areas by explicitly doing so on the top item of the area.
      */
     public void setDelegeateToggleToUpperNode(boolean delegeateToggleToUpperNode) { m_delegeateToggleToUpperNode = delegeateToggleToUpperNode; }
     public boolean getDelegeateToggleToUpperNode() { return m_delegeateToggleToUpperNode; }