I have a checkbox defined as

<telerik:RadButton ID="checkbox1" runat="server" Text="testing" ButtonType ="ToggleButton" ToggleType="CheckBox" OnClientClicked="checkbox1_ClientClicked"></telerik:RadButton>

What I want to do in the ClientClicked event is only check the box (and uncheck a different checkbox) when the user selects OK. Everything else seems to work fine but even though the last thing I do in the "ok" case is .set_checked(false) the box remains checked. Here is the javascript:

            function checkbox1_ClientClicked(sender, eventArgs) {
                var checkbox1 = $find('<%=checkbox1.ClientID%>');
                function CallbackFn(arg) {
                    if (arg) {
                        var checkbox1 = $find('<%=checkbox1.ClientID%>');  // I know I probably don't need this, just being safe
                        var checkbox2 = $find('<%=checkbox2.ClientID%>');
                        checkbox1.set_checked(true);
                        checkbox2.set_checked(false);
                    }
                    else {
                        checkbox1.set_checked(false);
                    }
                }
                if (checkbox1.get_checked()) {
                    return radconfirm("warning text", CallbackFn, 330, 150, null, "title");
                }
            }

I've also tried the ClientCheckedChanged and ClientCheckedChanging events with similar results. What obvious, basic thing am I missing? 8^)

That worked! The main difference seems to be using 'sender' rather than the object returned from $find, though I would have thought they pointed to the same object. Still new to JS so there's probably a nuance I'm missing. Many thanks!