WebHierarchcialDataSource にバインド

    <asp:AccessDataSource ID="CategoriesDS" runat="server" DataFile="~/App_Data/Nwind.mdb"
        SelectCommand="SELECT Categories.CategoryID, Categories.CategoryName FROM Categories ">
    </asp:AccessDataSource>
    <asp:AccessDataSource ID="ProductsDS" runat="server" DataFile="~/App_Data/Nwind.mdb"
        SelectCommand="SELECT Products.ProductID, Products.ProductName, Products.CategoryID FROM Products ">
    </asp:AccessDataSource>
    <ig:WebHierarchicalDataSource ID="whds" runat="server">
        <DataViews>
            <ig:DataView DataSourceID="CategoriesDS" ID="Categories" />
            <ig:DataView DataSourceID="ProductsDS" ID="Products" />
        </DataViews>
        <DataRelations>
            <ig:DataRelation ParentDataViewID="Categories" ParentColumns="CategoryID" ChildDataViewID="Products"
                ChildColumns="CategoryID" />
        </DataRelations>
    </ig:WebHierarchicalDataSource>

   <ig:WebExplorerBar GroupExpandBehavior="SingleExpanded" MaxGroupHeight="200px" DataSourceID="whds"
         InitialDataBindDepth="0" ID="WebExplorerBar1" runat="server" Width="300px">
        <DataBindings>
            <ig:ExplorerBarItemBinding DataMember="Categories" TextField="CategoryName" />
            <ig:ExplorerBarItemBinding DataMember="Products" TextField="ProductName" />
        </DataBindings>
    </ig:WebExplorerBar>