In radgrid how to set radiobutton to checked programmatically

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Telerik

radgrid

i have radgrid and i have two columns in that
1)imagebutton column 2)radiobutton column

on the click of imagebutton i want radiobutton of that row should be checked
how to do it?

What I have tried:

i tried following javascript pn rowclick of radgrid

function ValueChanged1() {
       var grid = $find("<%=dgSearchGrid.ClientID %>");
       var MasterTable = grid.get_masterTableView();
       var Rows = MasterTable.get_dataItems();
       for (var i = 0; i < Rows.length; i++) {
           var row = Rows[i];
           var radiobutton = row.findElement("chkSelect1");
           radiobutton.Checked = true;
       }