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Unable to design RadTreeView in Blend

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Todor asked on 08 Jun 2010, 10:26 AM

Hi,

I'm having a problem with setting the RadTreeViewItem's CheckState property through the ItemContainerStyle of the RadTreeView. Specifically, I receive an error message every time I try to edit the xaml in design mode with Blend (versions 3 or 4 RC) and nothing gets rendered on the design surfice. The message is:

"The member 'CheckState' is not recognized or is not accessible."

I managed to reproduce the problem with a stripped-down version of the xaml:

    
            <Window x:Class="WpfApplication18.MainWindow" x:Name="Window" 
        
                    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" 
        
                    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" 
        
                    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"   
        
                    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"               
        
                    xmlns:telerikNavigation="clr-namespace:Telerik.Windows.Controls;assembly=Telerik.Windows.Controls.Navigation" 
        
                    mc:Ignorable="d"   
        
                    Width="640" Height="480" 
        
                    xmlns:sys="clr-namespace:System;assembly=mscorlib">  
        
                <Grid>   
        
                    <telerikNavigation:RadTreeView IsOptionElementsEnabled="True">              
        
                        <telerikNavigation:RadTreeView.Items> 
        
                            <sys:String>Item 1</sys:String>               
        
                            <sys:String>Item 2</sys:String>               
        
                            <sys:String>Item 3</sys:String>      
        
                        </telerikNavigation:RadTreeView.Items> 
        
                        <telerikNavigation:RadTreeView.ItemContainerStyle> 
        
                            <Style TargetType="{x:Type telerikNavigation:RadTreeViewItem}">  
        
                                <Setter Property="CheckState" Value="On" />   

                                <Setter Property="OptionType" Value="CheckList" />                   
        
                            </Style> 
        
                        </telerikNavigation:RadTreeView.ItemContainerStyle> 
        
                    </telerikNavigation:RadTreeView>         
        
                </Grid> 
        
            </Window>

It's only the CheckState property that's causing the problem (the OptionType property from the sample works fine).
Sources on the internet suggest tha an internal exception in the property 'setter' might be causing such behavior but that's just a clue.
Do you have any idea how I can get it working in Blend ??

8 Answers, 1 is accepted

answered on 15 Jun 2010, 02:47 PM

silverlightapplication2.zip

Hello Todor,

Can you try the attached solution and let us know if you experience the problem again. It is working on our end. If the problem still persist - please give us the Blend version that you are using.

Thanks in advance for your cooperation!

Sincerely yours,
Valentin.Stoychev
the Telerik team

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answered on 17 Oct 2011, 11:31 AM

Hi Kevin ,

Unfortunately, we were unable to reproduce such issue. We tried with WPF Q2 2011 SP (0920) version of RadControls (and Blend 4) and the following code in Blend:

<telerik:RadTreeView Name="ExplorerTree">

<telerik:RadTreeView.ItemContainerStyle>

<Style TargetType="telerik:RadTreeViewItem">

<Setter Property="CheckState" Value="On" />

</Style>

</telerik:RadTreeView.ItemContainerStyle

</telerik:RadTreeView>

and it worked correctly. Please note that you cannot use SL solution and just replace its SL dlls with WPF ones. You have to use new WPF Application and place the WPF dlls in it. In WPF you also need the Telerik.Windows.Data dlls. Please let us know if this helped you.Regards,
Petar Mladenov
the Telerik team

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