Child GridView expander visibility

[Evgenii]

So, i have radGridView with child 
  <telerik:RadGridView x:Name="radGridView" Grid.Row="5" Grid.ColumnSpan="2"  CanUserFreezeColumns="False" ItemsSource="{Binding ParentCollection}" IsFilteringAllowed="False" AutoGenerateColumns="False" ShowGroupPanel="False" IsReadOnly="True">
                <telerik:RadGridView.ChildTableDefinitions>
                    <telerik:GridViewTableDefinition/>
                </telerik:RadGridView.ChildTableDefinitions>
                <telerik:RadGridView.Columns>
                    <!--some columns -->
                </telerik:RadGridView.Columns>
                <telerik:RadGridView.HierarchyChildTemplate  >
                    <DataTemplate>
                        <telerik:RadGridView x:Name="nestedRadGridView" CanUserFreezeColumns="False" AutoGenerateColumns="False" ItemsSource="{Binding ChildCollection}" IsFilteringAllowed="False" ShowGroupPanel="False" IsReadOnly="True">
                            <telerik:RadGridView.Columns>
                     <!--some columns -->
                            </telerik:RadGridView.Columns>
                        </telerik:RadGridView>
                    </DataTemplate>
                </telerik:RadGridView.HierarchyChildTemplate>
            </telerik:RadGridView>

need to hide expander of parent grid in rows which have empty child collection. Where i can set style of this togglebutton, tried HierarchyExpandButtonStyle but seems like my style is not applied.

[Dimitrina]

Hi,

 I would suggest you to check our custom hierarchy demo for more info. 

Greetings,
Didie
the Telerik team

[Evgenii]

Where i can find this demo? 

[Dimitrina]

Hi,

 You could download the WPF demos here. After you install them please search for "Custom Hierarchy".

Kind regards,
Didie
the Telerik team

[lun]

Hi everyone,

I post a short reply to help those who want implement this functionality in xaml side only.
The goal is to set the property 'IsExpandable' dynamically via a DataTrigger :

<telerik:RadGridView.HierarchyChildTemplate>
  <DataTemplate>
    <telerik:RadGridView AutoGenerateColumns="False" ShowGroupPanel="False" RowIndicatorVisibility="Hidden" ShowColumnHeaders="False" ItemsSource="{Binding MySource}">
      <telerik:RadGridView.RowStyle>
        <Style TargetType="telerik:GridViewRow">
          <Setter Property="IsExpandable" Value="True"/>
          <Style.Triggers>
            <DataTrigger Binding="{Binding Path=HasItems}" Value="False">
              <Setter Property="IsExpandable" Value="False"/>
            </DataTrigger>
          </Style.Triggers>
        </Style>
      </telerik:RadGridView.RowStyle>
      <telerik:RadGridView.Columns>
        <telerik:GridViewDataColumn DataMemberBinding="{Binding MyProperty}" />
      </telerik:RadGridView.Columns>
    </telerik:RadGridView>
  </DataTemplate>
</telerik:RadGridView.HierarchyChildTemplate>

regards,
Lun@ir

[Boris]

Hello lun,

Thank you for sharing your approach with our community.

Regards,
Boris
Telerik