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DHTMLTreeGrid sorting issue

I have a 1 column TreeGrid I am using. I know I could use a Tree right now but I plan to add more column in the near future. So the problem is, I can't seem to sort the TreeGrid after I build it using setColSorting(str). When I click on the header, it will sort, but I need it to sort itself. ANy ideas on why it is not sorting when I use .setColSorting(str)? I have pasted in 2 snippets below: Thanks in advance.

Stevo

init code on page load:
//load all products in TreeGrid
    mygrid = new dhtmlXGridObject('treegridbox');
    mygrid.setHeader("Products");
    mygrid.setInitWidths("*");
    mygrid.imgURL = "images/";
    mygrid.setColAlign("left")
    mygrid.setColTypes("tree");
mygrid.enableLightMouseNavigation(false);    
mygrid.attachEvent("onRowSelect", "OnProductDblClicked");
mygrid.setDragHandler(OnGridListDrop);

mygrid.setColSorting("str");
mygrid.enableDragAndDrop(true);
    mygrid.enableMercyDrag(true);
    mygrid.enableMultiselect(true);
mygrid.enableSmartXMLParsing(true);
mygrid.setSkin("sbdark");
mygrid.setEditable(false);
mygrid.setNoRecordsString("There are no products selected for this list.");
    mygrid.init();
    allProdsGridXML = executeTx(urlProds);
     mygrid.loadXMLString(allProdsGridXML); //txPLS.aspx?op=get&tx=lists



**************************************************************************************
rebuilding treegrid code:

mygrid.clearAll(); //clear out out data, start from scratch

if (rowId == -1)
{
mygrid.enableDragAndDrop(true);
if (allProdsGridXML.length > 1)
mygrid.loadXMLString(allProdsGridXML);
else
{
     allProdsGridXML = executeTx(urlProds);
     mygrid.loadXMLString(allProdsGridXML);
}

}
else
{
mygrid.enableDragAndDrop(false);
var temp = mylistsgrid.getSubItems(rowId);
if (temp.length > 0)
{
mygrid.enableMultiselect(true);
var ids=temp.split(",");
for (var i=0; i<ids.length; i++)
{
mylistsgrid.moveRowTo(ids[i],0,"copy","child",mylistsgrid,mygrid); //copying rows from one grid to the one I am building
}

mygrid.collapseAll();
mygrid.setColSorting("str");

The next command
    mygrid.setColSorting("str");
will just set default sorting type for the first column ( it enables sorting by clicking on grid header )
If you need to force sorting for column programatically - you can use next code
    grid.sortRows(0,"str","asc");   // sort first column, as strings, in ascendant order