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setHeader problem

I'm trying to dynamically reset the header on an onRowSelect event but my setHeader isn't working. Here the code:

vvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvvv
asset_grid = new dhtmlXGridObject('asset_div');
asset_grid.enableDragAndDrop(true);
asset_grid.enableMercyDrag(true);
asset_grid.setImagePath("js/dhtmlxGrid/imgs/");
asset_grid.setSkin("light");
asset_grid.setHeader("Applicable Process Groups");
asset_grid.setInitWidths("210");
asset_grid.setColAlign("left");
asset_grid.setColTypes("ro");
asset_grid.init();
asset_grid.loadXML("load_assets.php?option_id="+option_id);

...

option_grid = new dhtmlXGridObject('option_div');
option_grid.enableTreeCellEdit(false);
option_grid.enableDragAndDrop(true);
option_grid.setImagePath("js/dhtmlxGrid/imgs/");
option_grid.setSkin("light");
option_grid.setHeader("c1,c2,c3");
option_grid.setInitWidths("*,50,100");
option_grid.setColAlign("left,left,right");
option_grid.setColTypes("tree,ed,ed");
option_grid.setColSorting("str,na,na");
option_grid.setColumnIds("asset_name,mci,emb_co2");
option_grid.init();
option_grid.loadXML("load_option.php?option_id="+option_id+"&rv="+rv);

...

/* reload asset_grid list based on parent in option option_grid */
option_grid.attachEvent("onRowSelect",
    function(src_id) {
        var node_level = parseInt(option_grid.getLevel(src_id));
...
        if(node_level == 1) {
            alert(node_level);            
            asset_grid.setHeader("Applicable Process Groups");
        }else if(node_level == 2) {
            alert(node_level);            
            asset_grid.setHeader("Applicable Plant Groups");
        }else if(node_level == 3) {
            alert(node_level);            
            asset_grid.setHeader("Applicable Plant Group Models");
        }
    });

^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^^
The alert are popping up showing the appropriate level and that it's getting to the right part of the code. However, the head of the asset_grid just wont change.
Thanks in advance.

setHeader can be used to define grid header structure, it not suitable for dynamic change of header's labels
You can change your code as 

  if(node_level == 1) { 
  alert(node_level);  
  asset_grid.setColumnLabel(0,"Applicable Process Groups"); 

Thank you.  That's perfect.