如何设置 ComponentArt:NavBar 的最大宽度

Question

我有一个包含 TreeView 的 ComponentArt:NavBar，我希望用户能够扩展此 NavBar 的宽度，但只能扩展到内容的最大宽度。

<ComponentArt:NavBar Height="500px" ID="nbMenu" meta:resourcekey="nbMenu" runat="server" ClientTarget="Auto" CssClass="NavBar" 
            DefaultItemLookId="TopItemLook" DefaultItemSpacing="0" DefaultItemTextAlign="left" DefaultSelectedItemLookId="ExpandedTopLook" 
            ExpandSinglePath="True" ImagesBaseUrl="../Images/Icons/MenuItems/" Width="300px" BorderStyle="None" DefaultChildSelectedItemLookId="TopItemHover" 
            ScrollUpImageUrl="scrollup.gif" ScrollDownImageUrl="scrolldown.gif" ScrollUpHoverImageUrl="scrollup_hover.gif" ScrollDownHoverImageUrl="scrolldown_hover.gif" 
            ScrollUpActiveImageUrl="scrollup_active.gif" ScrollDownActiveImageUrl="scrolldown_active.gif" ScrollUpImageWidth="16" ScrollUpImageHeight="16" 
            ScrollDownImageWidth="16" ScrollDownImageHeight="16" ExpandDuration="350" CollapseDuration="350" ExpandTransition="Fade" 
            CollapseTransition="Fade" FullExpand="true" ClientScriptLocation="~/client_scripts/">
            <ItemLooks>
                <ComponentArt:ItemLook CssClass="TopItem" ExpandedCssClass="TopItemHover" HoverCssClass="TopItemHover" LookId="TopItemLook" />
                <ComponentArt:ItemLook CssClass="Level2Item" ExpandedCssClass="TopItemHover" HoverCssClass="Level2ItemHover" LabelPaddingTop="10px" LookId="Level2ItemLook" />
                <ComponentArt:ItemLook CssClass="CollapseTop" HoverCssClass="CollapseTopHover" LookId="ExpandedTopLook" />
                <ComponentArt:ItemLook CssClass="CollapseLevel2" HoverCssClass="CollapseLevel2Hover" LookId="ExpandedLevel2Look" />
            </ItemLooks>
            <ServerTemplates>
                <ComponentArt:NavigationCustomTemplate ID="TreeViewTemplate" meta:resourcekey="TreeViewTemplate">
                    <Template>
                        <asp:PlaceHolder ID="phTreeView" meta:resourcekey="phTreeView" runat="server"></asp:PlaceHolder>
                    </Template>
                </ComponentArt:NavigationCustomTemplate>
            </ServerTemplates>
        </ComponentArt:NavBar>

用于设置TreeView本身宽度的属性：

 private void BuildMenu(bool buildPartial)
    {
        int employeeIndex;

        // get the employee index
        employeeIndex = BuildEmployeeMenu();

        //Add a tree view to the menu item
        var tvBuilder = new TreeViewBuilder(TreeViewBuilder.Template.Version1);
        
        ComponentArt.Web.UI.TreeView tv = tvBuilder.CreateTreeView();
        tv.Width = Unit.Percentage(95);

        var dt = Signify.Framework.Security.Menu.SelectMenuManageEmployees();

        if (buildPartial)
        {
            BuildMenuTree(ref tv, ref dt, "EventCode IN ('" + Signify.Framework.Security.Menu.MenuItemList.MENU_HUMANRESOURCES_PERSONNEL_MANAGEEMPLOYEES_EMPLOYEES_ADMINISTRATION.ToString() + "','" + Signify.Framework.Security.Menu.MenuItemList.MENU_HUMANRESOURCES_PERSONNEL_MANAGEEMPLOYEES_EMPLOYEES_MASTERDATA.ToString() + "')");
        }
        else
        {
            DataRow[] dr;

            dr = dt.Select("EventCode = '" + Signify.Framework.Security.Menu.MenuItemList.MENU_HUMANRESOURCES_PERSONNEL_MANAGEEMPLOYEES_EMPLOYEES.ToString() + "'");

            if (dr.Length > 0)
            {
                BuildMenuTree(ref tv, ref dt, "FKstyMenuObjectID = " + dr[0]["ObjectID"].ToString());
            }
        }

        templateGenerator.GenerateTree(nbMenu.Items[employeeIndex].Items[0], tv, "GenerateTree", "phTreeView");

        if (!menuItemFound)
            hfMenuItemSelectedStartUrl.Value = "";


        hfTreeviewClientID.Value = tv.ClientID;
    }

我需要将树视图菜单扩展到最大宽度，并且不允许用户进一步扩展。