Binding within a control template - wpf

Question

I have the following template defined. The TextBlock PART_TextBlock binds correctly if outside of the StackPanel but when placed inside the StackPanel I get a binding error. The StackPanel datacontext is bound to a converter and is applying the storyboard (flashing tab) as required. I need the tab to flash and also the text to display in the tab header with the flashing in the background of the text.
<dashboard:EditableTabHeaderControl.Template>
<ControlTemplate TargetType="{x:Type dashboard:EditableTabHeaderControl}">
<Grid>
<Grid.RowDefinitions>
<RowDefinition Height="Auto" />
<RowDefinition Height="Auto" />
</Grid.RowDefinitions>
<StackPanel DataContext="{Binding Path=., Mode=OneWay, Converter={StaticResource DependencyObjectToFilterConverter}}" Grid.Row="1" Background="Transparent" >
<StackPanel.Style>
<Style TargetType="{x:Type StackPanel}">
<Style.Triggers>
<DataTrigger Binding="{Binding Path=HasError}" Value="True" >
<DataTrigger.EnterActions>
<BeginStoryboard Name="StartBlinking" >
<Storyboard>
<ColorAnimation
Storyboard.TargetProperty="Background.Color"
To="Red"
Duration="00:00:00.4"
RepeatBehavior="Forever"
AutoReverse="True" />
</Storyboard>
</BeginStoryboard>
</DataTrigger.EnterActions>
</DataTrigger>
<DataTrigger Binding="{Binding Path=HasError}" Value="False" >
<DataTrigger.EnterActions>
<RemoveStoryboard BeginStoryboardName="StartBlinking" />
</DataTrigger.EnterActions>
</DataTrigger>
</Style.Triggers>
</Style>
</StackPanel.Style>
<TextBlock Text=" " VerticalAlignment="Top">
</TextBlock>
<TextBox x:Name="PART_TabHeader" Text="{Binding Path=Title,
Mode=TwoWay, diag:PresentationTraceSources.TraceLevel=High}" Visibility="Collapsed">
</TextBox>
<TextBlock x:Name="PART_TextBlock" Text="{Binding Path=Title,
Mode=TwoWay, diag:PresentationTraceSources.TraceLevel=High}" >
</TextBlock>
</StackPanel>
<!-- IF THE TEXBOX/TEXTBLOCK ARE PLACED HERE TITLE BINDS CORRECTLY-->
</Grid>
<ControlTemplate.Triggers>
<Trigger Property="IsInEditMode" Value="True">
<Trigger.Setters>
<Setter TargetName="PART_TabHeader" Property="Visibility" Value="Visible"/>
<Setter TargetName="PART_TextBlock" Property="Visibility" Value="Collapsed"/>
</Trigger.Setters>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</dashboard:EditableTabHeaderControl.Template>
</dashboard:EditableTabHeaderControl>

Answer 1

I finally figured out the Binding expression, the following worked
Text="{Binding DataContext.Title, RelativeSource={RelativeSource AncestorType=dashboard:EditableTabHeaderControl}}"