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on combobox change, submit form and refresh grid data

Hi, I have a combo box and one grid, I would like to refresh the grid data when the combobox changes, doing a form post with, then refresh the grid data with the result of the form post.

Thanks

combo.attachEvent("onChange",function(){
    grid.clearAll();
    grid.post("base.url","combo="+combo.getActualValue());
})

post method not supported by default, but there is a separate patch, which adds such functionality
http://dhtmlx.com/docs/products/kb/index.shtml?cat=search&page=1&q=3450&ssr=yes&s=post%20load%20xml