[Solved] Cannot embed RadTabControl into RadGridView's RowDetailsTemplate

[Richard H]

Hi There,

I am having a problem in my Silverlight 4 project. If I nest a RadTabControl in a RowDetailsTemplate of the RadGridView control, at runtime when I try to expand the row details, the following error is logged in the output window and the details panel is not displayed:

System.Windows.Data Error: ConvertBack cannot convert value 'Visible' (type 'System.Windows.Visibility'). BindingExpression: Path='DetailsVisibility' DataItem='[GVR: Item=b;]' (HashCode=4368081); target element is 'Telerik.Windows.Controls.GridViewToggleButton' (Name=''); target property is 'IsChecked' (type 'System.Nullable`1[System.Boolean]').. System.Windows.Markup.XamlParseException: Set property 'System.Windows.Controls.ContentControl.Content' threw an exception. [Line: 26 Position: 25] ---> System.ArgumentNullException: Value cannot be null.
Parameter name: element
   at MS.Internal.XcpImports.ItemsControl_GetItemsOwner(DependencyObject element)
   at System.Windows.Controls.ItemsControl.ItemsControlFromItemContainer(DependencyObject container)
   at Telerik.Windows.Controls.ItemsControl.ItemsControlFromItemContainer(DependencyObject container)
   at Telerik.Windows.Controls.RadTabItem.get_Owner()
   at Telerik.Windows.Controls.RadTabItem.get_HasOwner()
   at Telerik.Windows.Controls.RadTabItem.OnContentChanged(Object oldContent, Object newContent)
   at System.Windows.Controls.ContentControl.OnContentChanged(IntPtr nativeTarget, CValue& oldContentValue, CValue& newContentValue)
   --- End of inner exception stack trace ---
   at MS.Internal.XcpImports.MethodEx(IntPtr ptr, String name, CValue[] cvData)
   at MS.Internal.XcpImports.MethodEx(DependencyObject obj, String name)
   at MS.Internal.XcpImports.DataTemplate_LoadContent(DataTemplate template)
   at System.Windows.DataTemplate.LoadContent()
   at Telerik.Windows.Controls.GridView.DetailsPresenter.LoadDetailsElement()
   at Telerik.Windows.Controls.GridView.DetailsPresenter.UpdateDetailsElement()
   at Telerik.Windows.Controls.GridView.DetailsPresenter.UpdateVisibility()
   at Telerik.Windows.Controls.GridView.DetailsPresenter.Telerik.Windows.Data.IWeakEventListener<System.ComponentModel.PropertyChangedEventArgs>.ReceiveWeakEvent(Object sender, PropertyChangedEventArgs args)
   at Telerik.Windows.Data.WeakEvent.WeakListener`1.Handler(Object sender, TArgs args)
   at Telerik.Windows.Controls.GridView.DetailsProvider.OnPropertyChanged(PropertyChangedEventArgs args)
   at Telerik.Windows.Controls.GridView.DetailsProvider.OnPropertyChanged(String propertyName)
   at Telerik.Windows.Controls.GridView.DetailsProvider.set_Visibility(Visibility value)
   at Telerik.Windows.Controls.GridView.GridViewRow.OnDetailsVisibilityPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at Telerik.Windows.PropertyMetadata.PropertyChangeHook.OnPropertyChanged(DependencyObject d, DependencyPropertyChangedEventArgs e)
   at System.Windows.DependencyObject.RaisePropertyChangeNotifications(DependencyProperty dp, Object oldValue, Object newValue)
   at System.Windows.DependencyObject.UpdateEffectiveValue(DependencyProperty property, EffectiveValueEntry oldEntry, EffectiveValueEntry& newEntry, ValueOperation operation)
   at System.Windows.DependencyObject.SetValueInternal(DependencyProperty dp, Object value, Boolean allowReadOnlySet, Boolean isBindingInStyleSetter)
   at System.Windows.DependencyPropertyListener.set_Value(Object value)
   at System.Windows.PropertyAccessPathStep.set_Value(Object value)
   at System.Windows.Data.BindingExpression.UpdateValue().

My XAML is as follows:

<UserControl x:Class="ReproProblem.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
    mc:Ignorable="d"
    d:DesignHeight="300" d:DesignWidth="400" >

    <Grid x:Name="LayoutRoot" Background="White">
        <telerik:RadGridView ItemsSource="{Binding MyData}">
            <telerik:RadGridView.Columns>
                <telerik:GridViewToggleRowDetailsColumn/>
            </telerik:RadGridView.Columns>
            <telerik:RadGridView.RowDetailsTemplate>
                <DataTemplate>
                    <Grid>
                        <telerik:RadTabControl>
                            <telerik:RadTabItem Header="Test">
                                <Button Content="Test"/>
                            </telerik:RadTabItem>
                        </telerik:RadTabControl>
                    </Grid>
                </DataTemplate>
            </telerik:RadGridView.RowDetailsTemplate>
        </telerik:RadGridView>
    </Grid>
</UserControl>

CodeBehind is as follows:

using System.Collections.Generic;
using System.Windows.Controls;

namespace ReproProblem
{
    public partial class MainPage : UserControl
    {
        public MainPage()
        {
            MyData = new List<string>() { "a", "b", "c" };
            InitializeComponent();
            this.DataContext = this;
        }
        public List<string> MyData { get; set; }
    }
}

I am using Silverlight 4 for my project (but also have the Silverlight 5 RC tools installed). I am also using RadControls for Silverlight - Build 2011.2.823.1040.

Thanks very much!

[Maya]

Hello Richard H,

I have tried to reproduce the issue you reported, but without any success. Would you take a look at the sample attached to verify whether I am missing something ?
 

Greetings,
Maya
the Telerik team

[Richard H]

Hi Maya,

Thanks for the quick reply!

When I open and run your sample, the problem still occurs. Do you have both the Silverlight 4 Tools and the Silverlight 5 RC Tools installed into Visual Studio 2010 SP1? I'm asking because that is what I have setup in my development environment and I suspect it may be related to installing the Silverlight 5 RC Tools. It was my understanding that installing the SL 5 RC Tools "shouldn't" have affected my SL4 project, but I'm not convinced because I have see other cases where that was not true.

Thanks,
Richard