PopOutImageUrl is not working in ASP.net Menu

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ASP.NET

Hi all,

I created a menu in the Site.Master in Asp.Net Web Application and I used PouOutImageUrl but it is not working.

am i missing any thing from my side?

Sample Code:

<asp:Menu ID="NavigationMenu" runat="server"  StaticEnableDefaultPopOutImage="true" DynamicEnableDefaultPopOutImage="true" StaticPopOutImageUrl="~/Images/nav_pointer.png" DynamicPopOutImageUrl="~/Images/nav_pointer.png" CssClass="menu" EnableViewState="false" IncludeStyleBlock="false" Orientation="Horizontal">

                  <Items>
                      <asp:MenuItem  NavigateUrl="~/Home.aspx" ImageUrl="~/Images/twitter.png" PopOutImageUrl="~/Images/nav_pointer.png" Text="Home">
                          <asp:MenuItem Text="Overview"/>
                          <asp:MenuItem Text="Edit" />
                          <asp:MenuItem Text="Create" />
                          <asp:MenuItem Text="Delete" />
                      </asp:MenuItem>
                  </Items>
              </asp:Menu>

Can any one answer me???