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TreeGrid intialization

i am trying to use ... dhtmltreegrid . i am four levels of hirarcehy of values , so thought of including a tree in agrid . could you please say the basic steps for tree grid ibntialization and wat all should be given in an xml file ... i hope i will get the query at earliest.

The init of treegrid basically it the same as init of grid, the only difference - one of column types must be "tree"

      mygrid = new dhtmlXGridObject('gridbox');
      mygrid.setHeader("Tree,Plain Text,Long Text,Color,Checkbox");
      mygrid.setInitWidths("150,100,100,100,100")
      mygrid.setColTypes("tree,ed,txt,ch,ch");
      mygrid.init();
      mygrid.loadXML("test_list_1.xml");

The XML of treeGrid is similar to XML of grid , with only small difference - it may contain nested row tags ( which will be rendered as sub levels inside treegrid )
Please refer to
    http://dhtmlx.com/docs/products/docsExplorer/doc/dhtmlxxml/index.html#dhtmlx_xml