RadTabControl headers show in design but not when running

[Richard]

Can you see any reason why the headers on my RadTabControl show in design view but when I run the app they do not show?  I attached a screenshot to show what it looks like.

<Grid Background="LightGray">
        <Grid.ColumnDefinitions>
            <ColumnDefinition Width="10"/>
            <ColumnDefinition Width="*"/>
            <ColumnDefinition Width="10"/>
        </Grid.ColumnDefinitions>
        <Grid.RowDefinitions>
            <RowDefinition Height="50"/>
            <RowDefinition Height="*"/>
            <RowDefinition Height="50"/>
        </Grid.RowDefinitions>
        <StackPanel Grid.Row="1" Grid.Column="1">
            <telerik:RadTabControl Height="400" >
                <telerik:RadTabControl.Items>
                    <telerik:RadTabItem Header="Generate Scripts" Foreground="white">
                        <telerik:RadTabItem.Content>
                            <Border Background="Bisque">
                                <TextBlock Text="The content of tab item 1" FontWeight="Bold" VerticalAlignment="Center" TextAlignment="Center" Foreground="Black"/>
                            </Border>
                        </telerik:RadTabItem.Content>
                    </telerik:RadTabItem>
                   
                    <telerik:RadTabItem Header="Admin" Foreground="white"/>
                    <telerik:RadTabItem Header="Users" Foreground="white"/>
                    <telerik:RadTabItem Header="Program / Hulls" Foreground="white"/>
                </telerik:RadTabControl.Items>
            </telerik:RadTabControl>        
        </StackPanel>
    </Grid>

[Sia]

Hello,

I did not manage to reproduce the reported issue locally. Please check the attached project. In order to find the reason behind it I will need some more details about your setup:

- Your Telerik binaries' version
- The Visual Studio version
- Do you use XAML or NoXAML binaries?
- How do you set the theme?
- Does the issue occur in isolated project or only in your main application?

Generally the reported issue seems strange to me and I do not remember such reports before.

Regards,
Sia
Progress Telerik