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<p>Ok, one day and no comment :), I got it done using RadTreeView, the RadTreeNode supports custom attributes, I added a custom attribute to distinguish between a category and an item, and in the NodeTemplate I used MultiView control which chooses the View to display by checking the node custom attribute. </p> <p>Here is some parts of the code,</p> <pre><code><telerik:RadTreeView ID="rtvQueries" runat="server" OnNodeExpand="rtvQueries_NodeExpand" Skin="Black" OnClientNodeClicking="CheckNodeType" OnNodeClick="rtvQueries_NodeClick"> <NodeTemplate> <asp:HiddenField ID="hfId" runat="server" Value='<%# Container.Value %>' /> <asp:MultiView ID="mvAll" runat="server" ActiveViewIndex='<%# Container.Attributes["ItemType"] == "C"? 0 : 1 %>'> <asp:View ID="vwCategory" runat="server"> <asp:Label ID="lblCategory" runat="server" Text='<%# Container.Text %>' /> </asp:View> <asp:View ID="vwQuery" runat="server"> <div style="float: left"> <asp:Label ID="lblQuery" runat="server" Text='<%# Container.Text %>' /> </div> <div style="float: left; margin-left: 20px; overflow: hidden; width: 200px;"> <asp:Label ID="lblCommandText" runat="server" Text='<%# Container.Attributes["CommandText"] %>' /> </div> </asp:View> </asp:MultiView> </NodeTemplate> </telerik:RadTreeView> </code></pre> <p>The code-behind for NodeExpand,</p> <pre><code>protected void rtvQueries_NodeExpand(object sender, RadTreeNodeEventArgs e) { Guid categoryId = new Guid(e.Node.Value); List<Category> cats = DBHelper.GetQueryCategories(categoryId); cats.ForEach(c => { RadTreeNode n = new RadTreeNode(c.Name, c.Id.ToString()); n.ExpandMode = TreeNodeExpandMode.ServerSideCallBack; n.Attributes["ItemType"] = "C"; e.Node.Nodes.Add(n); n.DataBind(); }); List<RightBI.Query> queries = DBHelper.GetQueriesByCategoryId(categoryId); queries.ForEach(q => { RadTreeNode n = new RadTreeNode(q.Name, q.Id.ToString()); n.Attributes["ItemType"] = "Q"; n.Attributes["CommandText"] = q.CommandText; e.Node.Nodes.Add(n); n.DataBind(); }); } </code></pre> <p>The only problem in this solution is I have to call DataBind on each node after adding it to the TreeView so the binding expressions evaluated.</p> <p>I still would like to see other solutions and comments on this solution or better ideas.</p>
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