带有引导的ASP.NET菜单控件

带有引导的ASP.NET菜单控件不显示DynamicPoputImage。 我试图显示默认图像或自定义图像。它不会渲染。菜单是从数据库构建的

   <div style="float:left">
    <asp:Menu ID="mainMenu" runat="server" 
        Orientation="Horizontal"
        RenderingMode="List"
        IncludeStyleBlock="false"
        StaticDisplayLevels="1"                           
        DynamicEnableDefaultPopOutImage="true"                            
        DynamicPopOutImageUrl="Images/arrow.gif"
        MaximumDynamicDisplayLevels="3" 
        EnableViewState="false"
        CssClass="nav navbar-fix-top" 
        StaticMenuStyle-CssClass="nav navbar-nav" 
        StaticSelectedStyle-CssClass="active"
        DynamicMenuStyle-CssClass="dropdown-menu"         
        SkipLinkText="">
    </asp:Menu>
</div>

找到了

       <div style="float:left">
                    <asp:Menu ID="mainMenu" runat="server" 
                           Orientation="Horizontal" 
                           EnableViewState="false"
                           CssClass="nav navbar-fix-top" 
                           StaticMenuStyle-CssClass="navbar " 
                           StaticSelectedStyle-CssClass="active"
                           RenderingMode="List"
                           DynamicMenuStyle-CssClass="dropdown-menu"  
                           DynamicMenuItemStyle-CssClass="dropdown"
                           StaticMenuItemStyle-HorizontalPadding="17"
                           DynamicEnableDefaultPopOutImage="true" 
                           StaticEnableDefaultPopOutImage="false"
                          StaticMenuItemStyle-BackColor="#F5F5F5"
                          StaticMenuItemStyle-ForeColor="Black"
                          StaticMenuItemStyle-BorderStyle="Ridge"
                          StaticMenuItemStyle-BorderWidth="1"
                          StaticMenuItemStyle-BorderColor="LightGray"
                          StaticMenuStyle-VerticalPadding="5"


                         >   
                    </asp:Menu>
          </div>

找到了

       <div style="float:left">
                    <asp:Menu ID="mainMenu" runat="server" 
                           Orientation="Horizontal" 
                           EnableViewState="false"
                           CssClass="nav navbar-fix-top" 
                           StaticMenuStyle-CssClass="navbar " 
                           StaticSelectedStyle-CssClass="active"
                           RenderingMode="List"
                           DynamicMenuStyle-CssClass="dropdown-menu"  
                           DynamicMenuItemStyle-CssClass="dropdown"
                           StaticMenuItemStyle-HorizontalPadding="17"
                           DynamicEnableDefaultPopOutImage="true" 
                           StaticEnableDefaultPopOutImage="false"
                          StaticMenuItemStyle-BackColor="#F5F5F5"
                          StaticMenuItemStyle-ForeColor="Black"
                          StaticMenuItemStyle-BorderStyle="Ridge"
                          StaticMenuItemStyle-BorderWidth="1"
                          StaticMenuItemStyle-BorderColor="LightGray"
                          StaticMenuStyle-VerticalPadding="5"


                         >   
                    </asp:Menu>
          </div>

这是带vb的ASP.NET 4.6这是带vb的ASP.NET 4.6