IsExpandable Is not hiding the Expand Button

[Josh]

I'm having issues with getting the IsExpandable property to be respected. Basically when my "Parent" has no children, I don't want the expand togglebutton to be shown. Below is some sample xaml that I am using. The resulting grid has the details column fully populated with the togglebuttons when there should be at least one without the button. I've stepped through my StyleSelector code and it is returning the proper style. But it doesn't appear to have any affect. What am I doing wrong?

<UserControl ...>
    <UserControl.Resources>
        <Style x:Key="NoChildrenRowStyle" TargetType="telerik:GridViewRow">
            <Setter Property="IsExpandable" Value="False"/>
        </Style>

        <Style x:Key="HasChildrenRowStyle" TargetType="telerik:GridViewRow">
            <Setter Property="IsExpandable" Value="True"/>
        </Style>
</UserControl.Resources>

 <local:RowStyleSelector x:Key="RowStyleSelector"
         NoChildrenStyle="{StaticResource NoChildrenRowStyle}"
         HasChildrenStyle="{StaticResource HasChildrenRowStyle}"/>

<telerik:RadGridView ItemsSource="{Binding ParentsCollectionView}"
        RowIndicatorVisibility="Collapsed"
        AutoGenerateColumns="False"
        RowStyleSelector="{StaticResource RowStyleSelector}">
            <telerik:RadGridView.Columns>
                <telerik:GridViewToggleRowDetailsColumn />
                <telerik:GridViewDataColumn Header="Name" DataMemberBinding="{Binding Name}"/>
                <telerik:GridViewDataColumn Header="Age" DatatMemberBinding="{Binding Age}"/>
            </telerik:RadGridView.Columns>
            <telerik:RadGridView.RowDetailsTemplate>
                <DataTemplate>
                    <ListBox ItemsSource="{Binding Children}">
                        <ListBox.ItemTemplate>
                            <DataTemplate>
                                <Grid>
                                    <TextBlock Text="{Binding Name}"/>
                                </Grid>
                            </DataTemplate>
                        </ListBox.ItemTemplate>
                    </ListBox>
                </DataTemplate>
            </telerik:RadGridView.RowDetailsTemplate>
        </telerik:RadGridView>
</UserControl>

[Yoan]

Hello Josh,

I would suggest you to check our custom hierarchy demo for more info. Although it is for Silverlight, you can find the same demo in your local copy of WPF demos.

Regards,
Yoan
the Telerik team

[Josh]

I'm sorry, but that answer is not helpful at the least. I've already seen the demo, I have a RowStyleSelector and it isn't working. The only difference I can see from your sample to mine is that I'm using a StyleSelector defined in code rather than xaml. But that shouldn't matter and if it does, then that's a huge shortcoming for you controls.

For clarity, I have a styleselector like this:

public class MyRowStyleSelector : StyleSelector
{
    public Style HasChildrenStyle { get; set; }
    public Style NoChildrenStyle { get; set; }

    public override Style SelectStyle(object item, System.Windows.DependencyObject container)
    {
        if (...)
        {
            return HasChildrenStyle;
        }

        return NoChildrenStyle;
    }
}

[Yoan]

Hi Josh,

Indeed, you can try using a hierarchy child template instead of using RowDetails. Please find attached a sample project that shows you the approach.

Regards,
Yoan
the Telerik team