Working code
btnSaveIssue_Click event get fire and populates the Grid...
       <ext:Button ID="btnSaveIssue" runat="server" Icon="Accept" Text="Save" CausesValidation="true">
                <AjaxEvents>
                    <Click FormID="mainForm" Method="POST" OnEvent="btnSaveIssue_Click" />
                </AjaxEvents>
            </ext:Button>
Code NOT Working
SaveFreezerIssued gets called, but Grid does NOT populate...
      <ext:Button ID="btnSaveIssue" runat="server" Icon="Accept" Text="Save" CausesValidation="true">
                <Listeners>
                    <Click Fn="DoConfirm" />
                </Listeners>
            </ext:Button>

    <script language="javascript" type="text/javascript">

        var DoConfirm = function() {
            Ext.Msg.confirm("Issue an additional if Needed", "Are you sure you wish to continue for this quantity?", function(result) {
                if (result == "yes") {
                    Coolite.AjaxMethods.FreezerManagement.SaveFreezerIssued();
                    return true;
                }
            })
            return false;
        }
       
    </script>