     //--------------------------------------------------------------------------  
     
     // The down,roll pairs of variables below define column indices.  Only one
-    // member of each pair will be not equal to -1 at a time.
+    // member of each pair will be not equal to -1 at a time. 
     
     private var rollColumnIndex:int = -1;      // column mouse has rolled into
     private var rollSeparatorIndex:int = -1;   // separator mouse has rolled into

                {
                    gridEventType = GridEvent.GRID_MOUSE_DOWN;
                    downSeparatorIndex = -1;
                    downColumnIndex = eventSeparatorIndex;
                }
                break;
        }

        overlayGroup.layout = new LayoutBase(); // no layout
        overlay.addDisplayObject(overlayGroup);
        
        // Event handlers that dispatch GridEvents
        
        MouseEventUtil.addDownDragUpListeners(this, 
            chb_mouseDownDragUpHandler, 
            chb_mouseDownDragUpHandler, 
            chb_mouseDownDragUpHandler);

        addEventListener(MouseEvent.MOUSE_MOVE, chb_mouseMoveHandler);
        addEventListener(MouseEvent.ROLL_OUT, chb_mouseRollOutHandler);
        addEventListener(MouseEvent.CLICK, chb_clickHandler);
        addEventListener(MouseEvent.DOUBLE_CLICK, chb_doubleClickHandler);
    }
    
    //--------------------------------------------------------------------------
