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Bug: Crash when setting IsVirtualization in a style setter

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This is a migrated thread and some comments may be shown as answers.
hwsoderlund
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hwsoderlund asked on 14 Nov 2012, 02:31 PM
The following xaml crashes with the message "The property 'IsVirtualizing' was not found in type 'Telerik.Windows.Controls.RadTreeView'. [Line: 15 Position: 30]"

If I comment out the style setter and put IsVirtualizing="True" directly on the treeview it works fine.

I am using the latest internal build (RadControls_for_Silverlight_5_2012_3_1112_DEV_hotfix).

<UserControl x:Class="TelerikTestProject01.MainPage_TreeView"
             xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
             xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
             xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation"
             mc:Ignorable="d"
             d:DesignHeight="300"
             d:DesignWidth="400">
 
    <UserControl.Resources>
 
        <Style x:Key="RadTreeViewStyle"
               TargetType="telerik:RadTreeView">
            <Setter Property="IsVirtualizing"
                    Value="True"></Setter>
        </Style>
 
    </UserControl.Resources>
 
    <Grid x:Name="LayoutRoot">
 
        <telerik:RadTreeView x:Name="RadTreeView1"
                           Style="{StaticResource RadTreeViewStyle}"></telerik:RadTreeView>
 
    </Grid>
</UserControl>

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Pavel R. Pavlov
Telerik team
answered on 16 Nov 2012, 10:21 AM
Hi Henrik,

You can only set a DependencyProperty using a Style.Setter. However, in the implementation of the RadTreeView, the IsVirtualizing property is defined as a simple boolean object which internally sets the TreeViewPanel.IsVirtualizing DependencyProperty. This is why if you need to control the virtualizaiton  feature through a style, you need to set the  of the TreeViewPanel.IsVirtualizing property as shown in the following snippet:
Grid x:Name="LayoutRoot">
    <Grid.Resources>
        <Style x:Key="RadTreeViewStyle" TargetType="telerik:RadTreeView">
            <Setter Property="telerik:TreeViewPanel.IsVirtualizing" Value="True"/>
        </Style>
    </Grid.Resources>
    <telerik:RadTreeView x:Name="RadTreeView1" Style="{StaticResource RadTreeViewStyle}" />
</Grid>

Let me know if you have any other questions.

Regards,
Pavel R. Pavlov
the Telerik team

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TreeView
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hwsoderlund
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Pavel R. Pavlov
Telerik team
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