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TreeGrid: How to make the Tree as Non-Editable?

Hi,
I wish to know as to how to make the tree as non-editable in a tree grid.
Also the Filtering is not working. Here is my code. I am using IE. Have included dhtmlxtreegrid.js,dhtmlxtreegrid_lines.js, dhtmlxtreegrid_filter.js
Without the filter functions the tree displays fine, however on using the Filter function, the tree itself is not shown.

    mygrid = new dhtmlXGridObject('gridbox');
    mygrid.setMultiselect = false;
    mygrid.imgURL = "Picture/";
    mygrid.enableTreeGridLines();
    mygrid.enableSmartXMLParsing(true);
    mygrid.setFiltrationLevel(-1);
    mygrid.enableFiltrationMode(-1,true);
    mygrid.attachEvent("onRowSelect",rowClick);
    mygrid.init();
    mygrid.setSkin("dhx_skyblue");
    mygrid.enableAlterCss("background-color: #fff","background-color: #fff");
    mygrid.loadXML("GridData_Workbench.xml");

Please let me know if I am missing anything.