The TabablzControl in Dragablz is capable of displaying content before and after the tab headers in a simple way. Use the HeaderPrefixContent and HeaderSuffixContent properties on TabablzControl. Use HeaderPrefixContentTemplate and HeaderSuffixContentTemplate respectively to provide a template to your content in case it is something else than XAML.

<dragablz:TabablzControl HeaderSuffixContent="After">
    <TextBlock Text="Tab 1"/>
    <TextBlock Text="Tab 2"/>

    <dragablz:TabablzControl.HeaderPrefixContent>
       <TextBlock>Before</TextBlock>
    </dragablz:TabablzControl.HeaderPrefixContent>        

    <dragablz:TabablzControl.HeaderSuffixContentTemplate>
      <DataTemplate>
         <TextBlock Text="{Binding}" ToolTip="You can easily insert content here using HeaderSuffixContent"/>
      </DataTemplate>
    </dragablz:TabablzControl.HeaderSuffixContentTemplate>       

</dragablz:TabablzControl>