How to use style for GroupBox header?

Question

I have lost of GroupBox in my form that their header text must be Bold. I know how to do it for a single GroupBox:

<GroupBox>      <GroupBox.Header>          <TextBlock Text="HEADER TEXT" FontWeight="Bold"/>      </GroupBox.Header> </GroupBox>  

But I'm interested to know how to do it with Styles. Here is what I have tried:

<Style TargetType="GroupBox">     <Setter Property="BorderBrush" Value="{StaticResource lightBlueBrush}"/>     <Setter Property="Margin" Value="25,1,5,5"/>     //<Setter ?? </Style> 

I have tried <Setter Property="HeaderTemplate" Value={StaticResource myTemp}> Which myTemp is a simple DataTemplate But VS suddenly closed! I'm not sure if I'm in the correct way of doing it, so anyone could help me?

EDIT: Please test your idea before posting it as an answer!

Answer 1

Did you try the following?

<Style TargetType="GroupBox">     <Setter Property="BorderBrush" Value="{StaticResource lightBlueBrush}"/>     <Setter Property="Margin" Value="25,1,5,5"/>     <Setter Property="HeaderTemplate">         <Setter.Value>             <DataTemplate>                 <TextBlock Text="{Binding}" FontWeight="Bold"/>             </DataTemplate>         </Setter.Value>     </Setter> </Style> 

Usage:

<GroupBox Header="Title" /> 

Answer 2

A groupboxs headerTemplate is a type of DataTemplate. so you should provide a datatemplate object insteed of style or template.

try below one.

   <Window.Resources>          <DataTemplate x:Key="DataTemplate1">             <TextBlock Text="Test Templated Header"/>         </DataTemplate>      </Window.Resources>     <Grid>         <GroupBox  Header="Test Header" HeaderTemplate="{StaticResource DataTemplate1}">             <Border BorderBrush="Red" Margin="10">                 <TextBlock Text="Hello"/>             </Border>         </GroupBox>     </Grid>