Group Header not showed with GroupStyle

[Dario Concilio]

Hi to all,

I configured a Listbox with single Group, but if I change a GroupStyle, Group item not longer appears.

my XAML/C# code is this, and I attached a screenshots (where I put a red rectangle, it not shows my value), where I wrong?

01.FastSearchItems = new ObservableCollection<FastSearchItem>();
02.var view = new CollectionViewSource();
03.view.GroupDescriptions.Add(new PropertyGroupDescription(propertyName: "Tipo"));
04.view.Source = FastSearchItems;
05.FastSearchItemsFound = view;
06.
07.//Add several items
08.FastSearchItems.Add(new FastSearchItem(/*parameter values*/));
09.//[..]

01.<telerik:RadListBox x:Name="FastSearchRadListBox" ItemsSource="{Binding FastSearchItemsFound.View}"
02.                    Grid.Row="2" Width="300" Grid.Column="2"
03.                    MouseDoubleClick="FastSearchRadListBox_MouseDoubleClick"
04.                    VerticalAlignment="Top"
05.                    Height="400" Visibility="{Binding FastSearchIsDropDownOpen,Converter={StaticResource VisibilityConverter}}"
06.                    ScrollViewer.VerticalScrollBarVisibility="Auto"
07.                    ScrollViewer.HorizontalScrollBarVisibility="Disabled">
08.    <telerik:RadListBox.ItemsPanel>
09.        <ItemsPanelTemplate>
10.            <StackPanel Orientation="Vertical" />
11.        </ItemsPanelTemplate>
12.    </telerik:RadListBox.ItemsPanel>
13.    <telerik:RadListBox.ItemTemplate>
14.        <DataTemplate>
15.            <StackPanel>
16.                <TextBlock Text="{Binding Caption}" />
17.            </StackPanel>
18.        </DataTemplate>
19.    </telerik:RadListBox.ItemTemplate>
20.    <telerik:RadListBox.GroupStyle>
21.        <GroupStyle>
22.            <GroupStyle.HeaderTemplate>
23.                <DataTemplate>
24.                    <StackPanel Orientation="Vertical" Background="#FAFAFA">
25.                        <TextBlock Text="{Binding Caption}" FontWeight="Bold"/>
26.                    </StackPanel>
27.                </DataTemplate>
28.            </GroupStyle.HeaderTemplate>
29.        </GroupStyle>
30.    </telerik:RadListBox.GroupStyle>
31.</telerik:RadListBox>

[Yana]

Hello Dario,

I have tested the provided code, but everything works as expected at our side - the group header is shown with Xaml and NoXaml assemblies. Could you try to create a sample app demonstrating the erroneous behavior and send it to us? You should open a support ticket and attache it there.

Regards,
Yana
Telerik by Progress

[Nicholas]

Hello,

I am experiencing the same issue that Dario was.

I am able to use a CollectionViewSource to group my listbox successfully. However, as soon as I try to set the template of the header, the text disappears, regardless of what color/size/weight of the font.

The header is still present, because the space is there and when I change the font size the gap for the group header changes. But as long as I have a header template set, I am unable to actually see the ListBox group header.

Dario, if you were able to resolve this issue, would you mind sharing your solution with me?

Here is my XAML:

Thanks

<telerik:RadListBox.GroupStyle>
    <GroupStyle>
        <GroupStyle.HeaderTemplate>
            <DataTemplate>
                <StackPanel Height="30" Margin="0 5 0 5">
                    <TextBlock Text="{Binding DrillTank}" FontWeight="Bold"/>
                </StackPanel>
            </DataTemplate>
        </GroupStyle.HeaderTemplate>
    </GroupStyle>
</telerik:RadListBox.GroupStyle>

[Vladimir Stoyanov]

Hi Nicholas,

Thank you for the shared pictures. 

Can you check out the following thread: ListBox Groupstyle display: How to design a group name?, where a similar question was discussed? Note, that it is for the native ListBox control, however it should be applicable for the RadListBox as well. 

I hope you find this helpful.

Regards,
Vladimir Stoyanov
Progress Telerik

[Nicholas]

Hello Vladimir,

That explanation makes perfect sense and solved my problem immediately. I appreciate your help.

Thank you!