WPF - "Padding" in TabItem or a distance between header and content - wpf

Question

I have a TabControl with a bunch of TabItems.
Between the TabItem's header and the content of the TabItem, I would like to have a distance of 15px.
I tried the TabItem's Padding property and set it to (0,15,0,0). But that didn't work.
I have tried to to set the TabItem's Template property but couldn't figure out how to set the distance.
The only solution I have found is to set a margin on the first control in the TabItem.
But I don't like that solution due to I have to implement that in each TabItem.
I would like a solution in a style so I can reuse the style for each TabItem instead.
Code
(Just copy-paste into a Window)
<Border BorderBrush="Black" BorderThickness="1">
<TabControl BorderThickness="0">
<TabControl.Resources>
<Style TargetType="{x:Type TabItem}" x:Key="TabItemStyle">
<Setter Property="HeaderTemplate">
<Setter.Value>
<DataTemplate>
<Label x:Name="TabItemHeaderLabel"
Foreground="Orange"
FontSize="18"
VerticalAlignment="Center"
HorizontalAlignment="Center"
Content="{Binding}" />
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsSelected, RelativeSource={RelativeSource AncestorType={x:Type TabItem}}}" Value="True">
<Setter TargetName="TabItemHeaderLabel" Property="Foreground" Value="Blue"/>
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</Setter.Value>
</Setter>
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<Border x:Name="Chrome"
BorderBrush="Blue"
Background="Transparent">
<ContentPresenter ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="Selector.IsSelected" Value="True">
<Setter TargetName="Chrome" Property="BorderThickness" Value="0,0,0,3"/>
</Trigger>
<Trigger Property="Selector.IsSelected" Value="False">
<Setter TargetName="Chrome" Property="BorderThickness" Value="0,0,0,0"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>
</Style>
</TabControl.Resources>
<!-- TabItem 1-->
<TabItem Style="{DynamicResource TabItemStyle}"
Header="Tab 1">
<!-- Notice the margin -->
<Grid Margin="0,15,0,0"
Background="Lime" />
</TabItem>
<-- TabItem 2-->
<TabItem Style="{DynamicResource TabItemStyle}"
Header="Tab 2">
<Grid Background="Red" />
</TabItem>
</TabControl>
</Border>
If you select the Tab 1 you will notice a distance of 15px between the blue line in the header and the green Grid.
If you select the Tab 2 you will not see a distance between the blue line and the red grid.
Is there a better way to include the distance of 15px into the style in someway?

Answer 1

Can't you simply add a bottom margin to the Border element in the ControlTemplate?:
<Setter Property="Template">
<Setter.Value>
<ControlTemplate TargetType="{x:Type TabItem}">
<Border x:Name="Chrome"
BorderBrush="Blue"
Background="Transparent"
Margin="0,0,0,15">
<ContentPresenter ContentSource="Header"
HorizontalAlignment="{TemplateBinding HorizontalContentAlignment}"
VerticalAlignment="{TemplateBinding VerticalContentAlignment}"/>
</Border>
<ControlTemplate.Triggers>
<Trigger Property="Selector.IsSelected" Value="True">
<Setter TargetName="Chrome" Property="BorderThickness" Value="0,0,0,3"/>
</Trigger>
<Trigger Property="Selector.IsSelected" Value="False">
<Setter TargetName="Chrome" Property="BorderThickness" Value="0,0,0,0"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</Setter.Value>
</Setter>