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tree in treegrid

I'm trying to place a tree in a treegrid column using stree
In the grid the value of the column is replaced with the text but if I doubleclick the cell no tree appears, it just sort of flashes but nothing happens
I had to add dhtmlxgrid_excell_tree.js (I'm using the full pro js)
Thanks for any help!
This is my code:
    mygrid = new dhtmlXGridObject('gridbox');
    mygrid.setSkin("modern");
    mygrid.attachEvent("onEditCell",doOnCellEdit);
    mygrid.attachEvent("onEnter",doOnEnter);
    mygrid.attachEvent("onRowSelect",LoadProperties);
... other events ..
    mygrid.imgURL = "/js/dhtmlx/imgs/";
    mygrid.enableDragAndDrop(true);
    var tree=new dhtmlXTreeObject('treeBox',"100%","100%",0);
    if (coltree.length) {
        tree.loadXML("/xml/tree.exml?table="+tabtree, function(){
                mygrid.setSubTree(tree,4); //here I also put setSubTree(tree,4,0) but no change
                mygrid.loadXML("/xml/treegrid.exml?table="+n+'&tipo='+tipo)
                mygrid.init();
        });
    }
    else mygrid.loadXML("/xml/treegrid.exml?table="+n+'&tipo='+tipo);