HeaderedContentControl.HeaderTemplate Property

<Style TargetType="HeaderedContentControl">
  <Setter Property="Template">
    <Setter.Value>
      <ControlTemplate TargetType="{x:Type HeaderedContentControl}">
        <StackPanel>
          <Grid>
            <Rectangle Stroke="{TemplateBinding Background}"/>
            <ContentPresenter ContentSource="Header"/>
          </Grid>
          <Grid>
            <Rectangle Fill="{TemplateBinding Background}"/>
            <ContentPresenter ContentSource="Content"/>
          </Grid>
        </StackPanel>
      </ControlTemplate>
    </Setter.Value>
  </Setter>
</Style>

<DataTemplate x:Key="titleText">
  <TextBlock Text="{Binding}" 
             Foreground="Green" 
             FontSize="16" 
             FontWeight="Normal"
             FontStyle="Italic" 
             TextWrapping="Wrap"/>
</DataTemplate>

<DataTemplate x:Key="contentText">
  <TextBlock Text="{Binding}"
             Foreground="Brown"
             FontSize="12"
             FontWeight="Normal"
             FontFamily="Arial Narrow" 
             TextWrapping="Wrap"/>
</DataTemplate>


...


<HeaderedContentControl Name="hcontCtrl" Background="Beige" 
                        HeaderTemplate="{StaticResource titleText}" 
                        ContentTemplate="{StaticResource contentText}"
                        Header="This is the header."
                        Content="This is the content."/>