Drop Indicator on Self-Referencing Heirarchical Tree List View not being displayed

[Kevin]

I have a problem with the tree list view.  I understand that out of the box the ASP.NET Ajax version of the TreeListView is supposed to support the Drop Line Indicator but on my implementation of the control I don't have that.  Is there something that I am doing or something that I should turn on?  I have looked through the documentation and I have looked through the forums and I keep getting references to wpf and silverlight and nothing on the asp.net AJAX control.  So a little help would be great.  Also attached is a screen shot of the site where I have this to show that I am not getting any indicator.  Here's my code:

<telerik:RadTreeList ID="MenuManager" runat="server">
    <Columns>
        <telerik:TreeListBoundColumn DataField="MenuText" HeaderText="Menu Name" UniqueName="Name" />
        <telerik:TreeListHyperLinkColumn DataNavigateUrlFields="SitePageID" DataNavigateUrlFormatString="/admin/pageManager/?CID={0}" DataTextField="PageTitle" HeaderText="Url Title" UniqueName="PageTitle"  />
        <telerik:TreeListBoundColumn DataField="MenuUrl" HeaderText="Url" UniqueName="MenuUrl" />
        <telerik:TreeListBoundColumn DataField="MenuTarget" HeaderText="Target" UniqueName="MenuTarget" HeaderStyle-Width="60px" />
        <telerik:TreeListBoundColumn DataField="IsEnabled" HeaderText="Status" UniqueName="MenuItemEnabled" HeaderStyle-Width="60px" />
        <telerik:TreeListEditCommandColumn ButtonType="ImageButton" HeaderStyle-Width="60px" />
        <telerik:TreeListButtonColumn ButtonType="ImageButton" ButtonCssClass="deleteConfirm" CommandName="Delete" HeaderStyle-Width="30px" />
    </Columns>
    <EditFormSettings UserControlPath="~/includes/userControls/MenuForm.ascx" EditFormType="WebUserControl">
    </EditFormSettings>
    <ClientSettings AllowItemsDragDrop="true">
        <Selecting AllowItemSelection="True" />
    </ClientSettings>
</telerik:RadTreeList>

Here is my code:

private string[] DataKey = { "MenuID" };
private string[] ParentKey = { "ParentID" };
private List<SiteMenu> MenuList = new List<SiteMenu>();

protected override void OnInit(EventArgs e)
{
    base.OnInit(e);
    MenuManager.Skin = "Default";
    MenuManager.AllowPaging = false;
    MenuManager.AutoGenerateColumns = false;
    MenuManager.GridLines = TreeListGridLines.Both;
    MenuManager.ShowTreeLines = false;
    MenuManager.NeedDataSource += MenuManager_NeedDataSource;
    MenuManager.ItemCommand += MenuManager_ItemCommand;
    MenuManager.InsertCommand += MenuManager_InsertCommand;
    MenuManager.UpdateCommand += MenuManager_UpdateCommand;
    MenuManager.DeleteCommand += MenuManager_DeleteCommand;
    MenuManager.ItemDataBound += MenuManager_ItemDataBound;
    MenuManager.ClientSettings.AllowItemsDragDrop = true;
    MenuManager.ClientSettings.Selecting.AllowItemSelection = true;
    MenuManager.AllowMultiItemSelection = true;
    MenuManager.DataKeyNames = DataKey;
    MenuManager.ParentDataKeyNames = ParentKey;
    MenuManager.ItemDrop += MenuManager_RowDrop;
    MenuManager.GridLines = TreeListGridLines.Both;

    MenuList = new SiteMenu().SelectAllPublicMenuItemsBySiteIDNotDeleted(ThisSiteID);
}

protected override void OnLoad(EventArgs e)
{
    base.OnLoad(e);
    if (!IsPostBack)
    {
        MenuManager.ExpandToLevel(1);
    }
}

protected void MenuManager_NeedDataSource(object sender, TreeListNeedDataSourceEventArgs e)
{
    MenuManager.DataSource = MenuList;
}

protected void MenuManager_ItemCommand(object sender, TreeListCommandEventArgs e)
{
    if (e.CommandName == RadTreeList.InitInsertCommandName)
    {
        MenuManager.ClientSettings.Reordering.AllowColumnsReorder = false;
    }
    if (e.CommandName == RadTreeList.CancelCommandName)
    {
        MenuManager.ClientSettings.Reordering.AllowColumnsReorder = true;
    }
}

protected void MenuManager_ItemDataBound(object sender, TreeListItemDataBoundEventArgs e)
{
    if (e.Item is TreeListDataItem)
    {
        TreeListDataItem item = (TreeListDataItem)e.Item;
        if (item["MenuItemEnabled"].Text == "True")
        {
            item["MenuItemEnabled"].Text = "Enabled";
        }
        else
        {
            item["MenuItemEnabled"].Text = "Disabled";
        }
        if (item["MenuUrl"].Text.Contains("?CID="))
        {
            item["MenuUrl"].Attributes.Add("style", "color:#AAA");
        }
    }
}

protected void MenuManager_InsertCommand(object sender, TreeListCommandEventArgs e)
{
    TreeListEditFormItem item = e.Item as TreeListEditFormItem;
    UserControl MenuForm = (UserControl)e.Item.FindControl(TreeListEditFormItem.EditFormUserControlID);

    int parentID = 0;

    if (item.ParentItem != null)
    {
        parentID = (int)item.ParentItem.GetDataKeyValue("MenuID");
    }

    RadComboBox menuType = (RadComboBox)MenuForm.FindControl("MenuSelectList");
    RadTextBox menuText = (RadTextBox)MenuForm.FindControl("MenuText");
    switch (menuType.SelectedItem.Text)
    {
        case "Editable Content":
            RadTextBox pageTitle = (RadTextBox)MenuForm.FindControl("PageTitle");
            CheckBox defaultHomepage = (CheckBox)MenuForm.FindControl("DefaultHomepage");
            if (new SiteMenu().InsertNewMenuItem(parentID, menuText.Text, pageTitle.Text, defaultHomepage.Checked))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        case "Document Link":
            UploadedFile uploadedFile = null;
            RadUpload docUpload = (RadUpload)MenuForm.FindControl("DocumentLink");
            docUpload.MaxFileSize = 10000000;
            if (docUpload.UploadedFiles.Count > 0)
            {
                uploadedFile = docUpload.UploadedFiles[0];
            }
            if (new SiteMenu().InsertNewDocumentLink(parentID, menuText.Text, uploadedFile.GetName()))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        case "External / Custom Link":
            RadTextBox linkUrl = (RadTextBox)MenuForm.FindControl("LinkUrl");
            RadComboBox target = (RadComboBox)MenuForm.FindControl("LinkTarget");
            if (new SiteMenu().InsertExternalLink(parentID, menuText.Text, linkUrl.Text, target.Text))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        case "Chamber Modules":
            RadComboBox moduleType = (RadComboBox)MenuForm.FindControl("ModulePageType");
            if (new SiteMenu().InsertNewModuleMenuItem(parentID, menuText.Text, moduleType.SelectedValue))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
    }
}

protected void MenuManager_UpdateCommand(object sender, TreeListCommandEventArgs e)
{
    TreeListEditFormItem item = e.Item as TreeListEditFormItem;
    UserControl MenuForm = (UserControl)e.Item.FindControl(TreeListEditFormItem.EditFormUserControlID);

    int thisMenu = (int)item.ParentItem.GetDataKeyValue("MenuID");

    RadComboBox menuType = (RadComboBox)MenuForm.FindControl("MenuSelectList");
    RadTextBox menuText = (RadTextBox)MenuForm.FindControl("MenuText");
    CheckBox enabled = (CheckBox)MenuForm.FindControl("MenuItemEnabled");

    switch (new SubCategory().SelectThisSubCategory(Convert.ToInt32(menuType.SelectedValue), PCSSession.Current.SiteID).TypeDescription.ToLower())
    {
        case "editable content":
            RadTextBox pageTitle = (RadTextBox)MenuForm.FindControl("PageTitle");
            CheckBox defaultHomepage = (CheckBox)MenuForm.FindControl("DefaultHomepage");
            if (new SiteMenu().UpdateThisMenuItem(ThisSiteID, thisMenu, menuType.SelectedValue, menuText.Text, pageTitle.Text, enabled.Checked, defaultHomepage.Checked))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        case "document link":
            UploadedFile uploadedFile = null;
            RadUpload docUpload = (RadUpload)MenuForm.FindControl("DocumentLink");
            docUpload.MaxFileSize = 10000000;
            if (docUpload.UploadedFiles.Count > 0)
            {
                uploadedFile = docUpload.UploadedFiles[0];

                if (new SiteMenu().UpdateThisDocumentLink(thisMenu, menuType.SelectedValue, menuText.Text, uploadedFile.GetName(), enabled.Checked))
                {
                    Response.Redirect("/admin/menuManager/");
                }
            }
            else
            {
                if (new SiteMenu().UpdateThisMenuText(thisMenu, menuType.SelectedValue, menuText.Text, enabled.Checked))
                {
                    Response.Redirect("/admin/menuManager/");
                }
            }
            break;
        case "external / custom link":
            RadTextBox linkUrl = (RadTextBox)MenuForm.FindControl("LinkUrl");
            RadComboBox target = (RadComboBox)MenuForm.FindControl("LinkTarget");
            if (new SiteMenu().UpdateThisExternalLink(thisMenu, menuType.SelectedValue, menuText.Text, linkUrl.Text, target.SelectedItem.Text, enabled.Checked))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        case "chamber modules":
            RadComboBox moduleType = (RadComboBox)MenuForm.FindControl("ModulePageType");
            if (new SiteMenu().UpdateThisModuleMenuItem(thisMenu, menuType.SelectedValue, menuText.Text, moduleType.SelectedValue, enabled.Checked))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
    }
}

protected void MenuManager_DeleteCommand(object sender, TreeListCommandEventArgs e)
{
    TreeListDataItem item = e.Item as TreeListDataItem;

    int thisMenuItem = (int)item.GetDataKeyValue("MenuID");

    int menuType = new SiteMenu().SelectThisMenuItem(thisMenuItem, ThisSiteID).MenuTypeID;
    switch (new SubCategory().SelectThisSubCategory(menuType, ThisSiteID).TypeDescription.ToLower())
    {
        case "document link":
            if (new SiteMenu().DeleteThisDocumentLink(thisMenuItem))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        case "editable content":
            if (new SiteMenu().DeleteTheEditableContentPage(thisMenuItem))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
        default:
            if (new SiteMenu().DeleteThisMenuItem(thisMenuItem))
            {
                Response.Redirect("/admin/menuManager/");
            }
            break;
    }
}

protected void MenuManager_RowDrop(object sender, TreeListItemDragDropEventArgs e)
{
    int key = (int)e.DraggedItems[0].GetDataKeyValue("MenuID");

    int destinationId = 0;
    int sortOrder = 0;

    if (IsUnder.Checked)
    {
        destinationId = (int)e.DestinationDataItem.GetDataKeyValue("MenuID");
        sortOrder = 1;
    }
    else
    {
        destinationId = (int)e.DestinationDataItem.GetParentDataKeyValue("ParentID");
        sortOrder = new SiteMenu().SelectThisMenuItem((int)e.DestinationDataItem.GetDataKeyValue("MenuID"), ThisSiteID).SortOrder + 1;
    }

    if (destinationId == 0)
    {
        if (key != destinationId)
        {
            MenuList.FirstOrDefault(i => i.MenuID == key).ParentID = destinationId;
            MenuList.FirstOrDefault(i => i.MenuID == key).SortOrder = sortOrder;

            foreach (SiteMenu menuItem in MenuList.Where(i => i.ParentID == destinationId))
            {
                if (menuItem.SortOrder >= sortOrder && menuItem.MenuID != key)
                {
                    menuItem.SortOrder += 1;
                }
            }

            if (new SiteMenu().UpdateMenuListByParentID(destinationId, MenuList.Where(i => i.ParentID == destinationId).ToList()))
            {
                Response.Redirect("/admin/menuManager/");
            }
        }
    }
    else
    {
        if (key != destinationId && key != MenuList.FirstOrDefault(i => i.MenuID == destinationId).ParentID)
        {
            MenuList.FirstOrDefault(i => i.MenuID == key).ParentID = destinationId;
            MenuList.FirstOrDefault(i => i.MenuID == key).SortOrder = sortOrder;

            foreach (SiteMenu menuItem in MenuList.Where(i => i.ParentID == destinationId))
            {
                if (menuItem.SortOrder >= sortOrder && menuItem.MenuID != key)
                {
                    menuItem.SortOrder += 1;
                }
            }

            if (new SiteMenu().UpdateMenuListByParentID(destinationId, MenuList.Where(i => i.ParentID == destinationId).ToList()))
            {
                Response.Redirect("/admin/menuManager/");
            }
        }
    }
}

[Galin]

Hello Kevin,

The RadTreeList does not have a drop line indicator like the RadGrid, because this is a hierarchy structure and usually you cannot drop the item between two others.

The arrow indicates you when you can drop the item.

I hope this helps.

Greetings,
Galin
the Telerik team

[Kevin]

No this doesn't help but it does answer the question.  I have created some custom handling so that each drop moves the item as a sibling instead of a child.  For the most part this works great but it doesn't show the end user where the drop will occur.  Adding this functionality would be very helpful if this is possible.