<telerik:RadListView ID="RadListView3" runat="server" OnLayoutCreated="OnLayoutCreated" ItemPlaceholderID="ProductsContainerItems" OnItemCommand="RadListViewItemCommand" GroupPlaceholderID="GroupsProductsContainer" GroupItemCount="4">

<LayoutTemplate>

    <asp:PlaceHolder ID="GroupsProductsContainer" runat="server" />

</LayoutTemplate>

<GroupTemplate>

    <fieldset style="float: left; width: auto; border-width:1px; border-color:Gray; ">

    <legend><asp:Label ID="lblLegendDag" runat="server" Text="Maurice"></asp:Label></legend>

    <div id="contentproducts">

        <asp:PlaceHolder ID="ProductsContainerItems" runat="server" />

    </div>

    </fieldset>

</GroupTemplate>

How can I set the label lblLegendDag which is in the GroupTemplate.
I tried this with the following code, but this is not working.

Label test = (Label)RadListView3.FindControl("lblLegendDag");

The result is that test delivers null.

Can someone helps me with this problem.

<telerik:RadToolBarButton runat="server" ImageUrl="~/images/btnDel.png" Value="delete"
            CommandName="DeleteSelected" Enabled="false"/>

function ToolbarClientButtonClicking(sender, args) {
            if (args.get_item().get_value() == "delete") {               
                 args.set_cancel(!confirm("Delete selected rows?"));
                return;
            }