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smartrenderng and reload grid

 Hi,
 i need to refresh grid contents with different number of rows (more or less) in a grid with smartrendering.

I create grid as usual:
    ...
    grid = new dhtmlXGridObject("gridbox");//
    ...
    grid.init();
    grid.enableSmartRendering(true, 0);
    grid.loadXML(s_xmlurl);
    ...

    and it works fine with smartrendering

   when  i tried to refresh, for example:
        ...
        grid.clearAll();
        grid.enableBuffering(1000);
        grid.enableSmartRendering(true, 0);
        grid.loadXML(s_newxmlurl);
        ...
    after refresh, the grid loose the smartrendering mode.
    Any advice to preserve smartrendering?

    thanks in advance.

    Rubino