Insert the Name of a BindingSource into a String? - xaml

Question

I want to use a DataTemplate to change the Header of some TabItems.
So far I have this Code, which works fine:
<Window
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
xmlns:xctk="http://schemas.xceed.com/wpf/xaml/toolkit" x:Class="SFgame.MainWindow"
Title="SoccerFusion" Height="600" Width="1000" ResizeMode="NoResize" WindowStartupLocation="CenterScreen">
<Grid>
<TabControl TabStripPlacement="Bottom">
<TabControl.Resources>
<Style TargetType="{x:Type TabPanel}">
<Setter Property="HorizontalAlignment" Value="Center" />
</Style>
<DataTemplate x:Key="mmHeaderTemplate">
<Image Name="mmItem1" />
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Path=IsSelected,RelativeSource={RelativeSource TemplatedParent}}" Value="True">
<Setter TargetName="mmItem1" Property="Source" Value="data\Images\Menu\ActiveItem.png" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsSelected,RelativeSource={RelativeSource TemplatedParent}}" Value="False">
<Setter TargetName="mmItem1" Property="Source" Value="data\Images\Menu\InactiveItem.png" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</TabControl.Resources>
<TabItem Height="32" Width="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" IsSelected="True">
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Height="32" Width="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" >
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Height="32" Width="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" >
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Height="32" Width="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" >
<Grid Background="#FFE5E5E5"/>
</TabItem>
</TabControl>
</Grid>
</Window>
The only problem is, that now all TabItem-Headers have the same Picture. All TabItems should have different pairs of Pictures fpr active and inactive.
So I guess I would pass the path of the picture as parameter, but I just can't figure out how that works.
The only thing I can find is: "Can't pass Parameters".
If that really doesn't work. Is there an alternative? For example give the TabItem a Name like "TabItem1" and usw the Path "data\Images\Menu\Tabitem1_active.png" and "data\Images\Menu\Tabitem1_inactive.png" as Source? Can I insert the Name of the Binding-Source into a string?
Edit:
I'm a little closer to a solution
<Setter TargetName="mmItem1" Property="Source">
<Setter.Value>
<MultiBinding StringFormat="{}{0}{1}{2}">
<Binding Mode="OneTime" Source="data\Images\Menu\" />
<Binding Mode="OneTime" Source="??????" />
<Binding Mode="OneTime" Source="inactive.png" />
</MultiBinding>
</Setter.Value>
</Setter>
with this code instead of the one on the upper, i can concat three strings. the only thing i need now, is the name of the sourcecontrol/bindingsource
Next Edit:
I'm a little closer i think. I succeeded in getting a string from my tabitem to the Template, by using the Header of the TabItem.
Code looks like this now:
<Page
xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
Title="SoccerFusion" Height="400" Width="400">
<Grid>
<TabControl TabStripPlacement="Bottom">
<TabControl.Resources>
<Style TargetType="{x:Type TabPanel}">
<Setter Property="HorizontalAlignment" Value="Center" />
</Style>
<DataTemplate x:Key="mmHeaderTemplate">
<Grid>
<Image Name="mmImg" />
<TextBlock Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content, StringFormat='{}{0}'}" />
</Grid>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding Path=IsSelected,RelativeSource={RelativeSource TemplatedParent}}" Value="True">
????? HERE COMES THE PROBLEM ??????
<Setter TargetName="mmImg" Property="Source" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content, StringFormat='{}{0}active.png'}" />
</DataTrigger>
<DataTrigger Binding="{Binding Path=IsSelected,RelativeSource={RelativeSource TemplatedParent}}" Value="False">
????? HERE COMES THE PROBLEM ??????
<Setter TargetName="mmImg" Property="Source" Value="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=Content, StringFormat='{}{0}inactive.png'}" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</TabControl.Resources>
<TabItem Height="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" IsSelected="True" Header="mmItem1">
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Height="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" Header="mmItem2" >
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Height="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" Header="mmItem3" >
<Grid Background="#FFE5E5E5"/>
</TabItem>
<TabItem Height="32" HeaderTemplate="{StaticResource mmHeaderTemplate}" Header="mmItem4" >
<Grid Background="#FFE5E5E5"/>
</TabItem>
</TabControl>
</Grid>
</Page>
The Problem is:
I generate a String and give it to the Image as a Source. Which works fine.
But the Source needs an URI and can't do anything with the String
Any Ideas?