RadTabStrip / RadMultiPage state lost when inside nested control in SharePoint web part

[William Cook]

Embedding a RadMultiPage / RadTabStrip directly into a SharePoint web part works fine, but for code organization I would like to nest them into a separate control. Once I do this, the control re-creation doesn't work (at least, not the ways I have tried it :)). Specifically, when the RadMultiPage / RadTabStrip are part of the WebPartWithTelerik class (which inherits from System.Web.UI.WebControls.WebParts.WebPart), the RadGrid controls on each page allow editing correctly; however, when they are moved down into the WebPartPanel class, clicking Edit on the RadGrid on either page causes the entire page to re-load, and the controls are not in edit mode as their state has been lost.

Scenario:
* RadTabStrip / RadMultiPage combo with two RadPageView objects.
* Each RadPageView contains a single RadGrid which retrieves data via LinqToSql data sources.
* MOSS web site using VSEWSS 1.3 to build the web part in VS 2008.

I've tried a few iterations of this (attemping to serialize the container object, etc.) with no success. Here's hoping there's a simple fix out there.

Thanks,

William Cook

using System;
using System.Runtime.InteropServices;
using System.Web.UI;
using System.Web.UI.WebControls;
using System.Web.UI.WebControls.WebParts;
using System.Xml.Serialization;

using Microsoft.SharePoint;
using Microsoft.SharePoint.WebControls;
using Microsoft.SharePoint.WebPartPages;

using Telerik.Web.UI;

namespace WebPartWithTelerik
{
    [Guid("1d53c24d-161e-4fca-86b0-9a8f589e3ee9")]
    public class WebPartWithTelerik : System.Web.UI.WebControls.WebParts.WebPart
    {
        private WebPartPanel Panel;
        //{
        //    get { return (WebPartPanel)ViewState["Panel"]; }
        //    set { ViewState["Panel"] = value; }
        //}

        public WebPartWithTelerik()
        {
        }

        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            // Add the controls to the page.
            this.Panel = new WebPartPanel();
            this.Controls.Add(this.Panel);
        }
    }

    public class WebPartPanel : Panel
    {
        private Telerik.Web.UI.RadMultiPage MultiPage;
        //{
        //    get { return (RadMultiPage)ViewState["MultiPage"]; }
        //    set { ViewState["MultiPage"] = value; }
        //}
        private Telerik.Web.UI.RadTabStrip TabStrip;
        //{
        //    get { return (RadTabStrip)ViewState["TabStrip"]; }
        //    set { ViewState["TabStrip"] = value; }
        //}

        public WebPartPanel()
        {
            this.ID = "WebPartPanelID";
        }


        protected override void CreateChildControls()
        {
            base.CreateChildControls();

            // Create a simple label to validate rendering of controls.
            Label label = new Label();
            label.Text = "Test web part for Telerik controls in a SharePoint web part.";
            this.Controls.Add(label);

            //this.ChildrenAsTriggers = true;
            //this.UpdateMode = UpdatePanelUpdateMode.Conditional;

            // Create two RadPageView objects.
            RadPageView pageOne = new RadPageView();
            pageOne.ID = "pageOne";
            RadPageView pageTwo = new RadPageView();
            pageTwo.ID = "pageTwo";

            // Create the RadMultiPage object.
            this.MultiPage = new RadMultiPage();
            this.MultiPage.ID = "multiPage";
            this.MultiPage.PageViewCreated += new RadMultiPageEventHandler(MultiPage_PageViewCreated);
            this.MultiPage.PageViews.Add(pageOne);
            this.MultiPage.PageViews.Add(pageTwo);

            // Create the RadTab objects.
            RadTab tabOne = new RadTab("One");
            tabOne.PageViewID = pageOne.UniqueID;
            RadTab tabTwo = new RadTab("Two");
            tabTwo.PageViewID = pageTwo.UniqueID;

            // Create the tabstrip.
            this.TabStrip = new RadTabStrip();
            this.TabStrip.ID = "tabStrip";
            this.TabStrip.MultiPageID = this.MultiPage.UniqueID;
            this.TabStrip.Tabs.Add(tabOne);
            this.TabStrip.Tabs.Add(tabTwo);

            // Add the controls to the page.
            this.Controls.Add(this.TabStrip);
            this.Controls.Add(this.MultiPage);
        }

        void MultiPage_PageViewCreated(object sender, RadMultiPageEventArgs e)
        {
            // Create a simple label to validate rendering of controls.
            Label label = new Label();
            label.Text = e.PageView.ID;
            e.PageView.Controls.Add(label);

            LinqDataSource dataSource = new LinqDataSource();
            DataClassesDataContext context = new DataClassesDataContext();
            dataSource.ContextTypeName = context.GetType().AssemblyQualifiedName; //"WebPartWithTelerik.DataClassesDataContext, WebPartWithTelerik, Version=1.0.0.0, Culture=neutral, PublicKeyToken=23df81aee7a34b62";
            context.Dispose();
            dataSource.EnableInsert = true;
            dataSource.EnableUpdate = true;

            // Create the grid for the page.
            RadGrid grid = new RadGrid();
            grid.AutoGenerateColumns = true;
            grid.AutoGenerateEditColumn = true;
            grid.AllowAutomaticInserts = true;
            grid.AllowAutomaticUpdates = true;
            grid.MasterTableView.DataKeyNames = new string[] { "TypeID" };
            switch (e.PageView.ID)
            {
                case "pageOne":
                    //dataSource.ID = "dataSourceOne";
                    dataSource.TableName = "TableOnes";
                    grid.ID = "gridOne";
                    grid.NeedDataSource += new GridNeedDataSourceEventHandler(grid_NeedDataSourceOne);
                    break;
                case "pageTwo":
                    //dataSource.ID = "dataSourceTwo";
                    dataSource.TableName = "TableTwos";
                    grid.ID = "gridTwo";
                    grid.NeedDataSource += new GridNeedDataSourceEventHandler(grid_NeedDataSourceTwo);
                    break;
            }

            // Bind the data source.
            //dataSource.DataBind();
            e.PageView.Controls.Add(dataSource);

            // Add the grid to the PageView.
            grid.DataSourceID = dataSource.UniqueID;
            grid.MasterTableView.ID = grid.ID + "_MasterTableView";
            e.PageView.Controls.Add(grid);
        }

        void grid_NeedDataSourceOne(object source, GridNeedDataSourceEventArgs e)
        {
            RadGrid grid = (RadGrid)source;
            grid.DataSourceID = "dataSourceOne";
        }
        void grid_NeedDataSourceTwo(object source, GridNeedDataSourceEventArgs e)
        {
            RadGrid grid = (RadGrid)source;
            grid.DataSourceID = "dataSourceTwo";
        }
    }
}

[Nikolay Rusev]

Hello William,

I suspect that RadGrid is not recreated on time on postback. Bellow links explains how you can create RadGrid programmatically:
http://demos.telerik.com/aspnet-ajax/grid/examples/hierarchy/definingstructure/defaultcs.aspx
http://demos.telerik.com/aspnet-ajax/grid/examples/programming/groupby/defaultcs.aspx

I will suggest you create your control on Init event. This should solve the state issue.

Kind regards,
Nikolay
the Telerik team

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