How do I style the cells in the Group Panel?

[Sam]

Hi, I'm trying to change the background color of the cells shown in a RadGridView GroupPanel, using the Metro theme.

After reading the documentation I tried this approach:

<UserControl
    x:Class="SampleApp.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:telerik="http://schemas.telerik.com/2008/xaml/presentation">

    <UserControl.Resources>
        <Style x:Key="MyGroupPanelItemStyle" TargetType="telerik:GridViewGroupPanelItem">
            <Setter Property="Background" Value="Red" />
            <Setter Property="Foreground" Value="Green" />
        </Style>
    </UserControl.Resources>

    <Grid x:Name="LayoutRoot">
        <Grid.RowDefinitions>
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>

        <telerik:RadGridView
            ShowGroupPanel="True"
            AutoGenerateColumns="True"
            ItemsSource="{Binding Items}"
            GroupPanelItemStyle="{StaticResource MyGroupPanelItemStyle}" />
    </Grid>
</UserControl>

But this doesn't work - the style doesn't appear to be applied at all.

How do I target the style of these items? What am I missing?

Thanks,

Sam

[Vlad]

Hi,

 How this Metro theme is applied? Are you using implicit themes? If this is the case you need to specify BasedOn for your style.

Regards,
Vlad
the Telerik team

[Sam]

At the moment I'm just using a sample application that has a direct reference to the Metro theme DLL. I just want to be able to change the colour in this sample app first.

Also, we can't use implicit themes in our application - what's the simplest way to style the GroupPanel cells without requiring an implicit theme?

[Yordanka]

Hi Sam,

In order to apply style you should target GridViewGroupPanelCell as follow:

<Style TargetType="telerik:GridViewGroupPanelCell">
            <Setter Property="Background" Value="Red" />
            <Setter Property="Foreground" Value="Green" />
        </Style>

However, when a theme different from the default Office_Black is applied there is an issue and this style will not be applied. The problem is logged as PITS 12577 where you can vote and track the progress. 

This style will work if you use implicit theme. I am attaching sample project for a reference.

Kind regards,
Yordanka
the Telerik team

[Sam]

Thanks Yordanka, looks like it's a bug for now as we can't use implicit themes or the default theme.

Hope it gets resolved soon!

Thanks,

Sam