silverlight - Strange behaviour when not using dispatcher -

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i know must use dispatcher whenever try access ui element different thread, today encountered want ask about. have list populated objects of class row ( custom class) , each row populated cell(custom class). each cell has property cellwidth. populate list inside viewmodel , pass view make observablecollection out of list. grid's width bound cellwidth in ui. so, if set width not using dispatcher ( inside viewmodel), grid ignores binding, if use , works fine. (note: exception not raised when don't use dispatcher)

the question is: why happening? thought issue dispatcher addresses threading...

    public mainpageviewmodel() {     idatatablemodel  table1 = new observablecollection<row>();             setcellwidth(table1); }  private void setcellwidth(idatatablemodel model) {     list<double> widths = new list<double>();     //initializing widths values     <...>       deployment.current.dispatcher.begininvoke(() =>     {         foreach(var item in model.rows)        {            for(int = 0; i<item.cells.count; i++)            {                 item[i].cellwidth = widths[i];            }        }     }); }


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