WPF nested template binding in itemscontrol - wpf

Question

I have a problem with nested template bindings.
Having an ItemsControl with a template, which works great. This template contains a tooltip as well (which shows perfectly).
<Button.ToolTip>
<TextBlock Text="{Binding Path=DetailPaneText}" />
</Button.ToolTip>
But inside the itemscontrol template, I have a ToggleButton with another template inside it. And I can't seem to show the text over there as well since the binding isn't correct.
Code inside the toggle button
<StackPanel Background="#293344" Width="200" x:Name="DetailTab" Margin="0">
<TextBlock FontSize="12" Text="" Foreground="White" />
</StackPanel>
What kind of binding or syntax should I put in between the Text tags? I tried several options but none of them seemed to work yet. Currently out of guesses.
Thanks
Complete code snippet
<ItemsControl.ItemTemplate>
<DataTemplate>
<StackPanel Orientation="Horizontal" Margin="0" >
<Button Command="{x:Static CobraInfrastructure:Commands.NavigateFromBreadcrumb}" CommandParameter="{Binding Path=Current}" Tag="{Binding DetailPaneText}" x:Name="TextBlock_Detail" Style="{DynamicResource BreadcrumbButton}">
<Button.Resources>
<Style BasedOn="{StaticResource {x:Type ToolTip}}" TargetType="ToolTip">
<Setter Property="Background" Value="#F8F8F8" />
<Setter Property="BorderBrush" Value="{x:Null}" />
<Setter Property="Padding" Value="15" />
<Setter Property="MinWidth" Value="300" />
<Setter Property="MinHeight" Value="150" />
<Setter Property="VerticalAlignment" Value="Top" />
</Style>
</Button.Resources>
<Button.ToolTip>
<TextBlock Text="{Binding Path=DetailPaneText}" />
</Button.ToolTip>
<Grid Margin="5">
<Grid.ColumnDefinitions>
<ColumnDefinition Width="*"/>
<ColumnDefinition Width="20"/>
</Grid.ColumnDefinitions>
<Grid.RowDefinitions>
<RowDefinition Height="20"/>
<RowDefinition Height="auto"/>
</Grid.RowDefinitions>
<TextBlock x:Name="HyphenTextBlock" HorizontalAlignment="Stretch" VerticalAlignment="Stretch" Text="{Binding Path=EntityTitle}" FontSize="12" FontWeight="Bold" Foreground="White" Grid.Row="0" Grid.Column="0"/>
<TextBlock VerticalAlignment="Stretch" Text="{Binding Path=Text, NotifyOnTargetUpdated=True, Mode=OneWay}" FontSize="10" Grid.Row="1" Grid.Column="0" Grid.ColumnSpan="2"/>
</Grid>
</Button>
<ToggleButton Focusable="False" Style="{DynamicResource BreadcrumbOpenButton}" VerticalAlignment="Stretch" HorizontalAlignment="Center" Tag="{Binding Path=DetailPaneText}">
<ToggleButton.Template>
<ControlTemplate TargetType="{x:Type ToggleButton}">
<StackPanel Orientation="Horizontal">
<Border Width="13" Background="#293344">
<fa:FontAwesome Icon="CaretRight" Foreground="White" FontSize="18" VerticalAlignment="Center" HorizontalAlignment="Center" />
</Border>
<StackPanel Background="#293344" Width="200" x:Name="DetailTab" Margin="0">
<TextBlock FontSize="12" Text="" Foreground="White" />
</StackPanel>
</StackPanel>
<ControlTemplate.Triggers>
<Trigger Property="IsChecked" Value="True">
<Setter Property="Width" TargetName="DetailTab" Value="200"/>
</Trigger>
<Trigger Property="IsChecked" Value="False">
<Setter Property="Width" TargetName="DetailTab" Value="1"/>
</Trigger>
</ControlTemplate.Triggers>
</ControlTemplate>
</ToggleButton.Template>
</ToggleButton>
</StackPanel>
<DataTemplate.Triggers>
<DataTrigger Binding="{Binding IsVisible}" Value="False">
<Setter Property="Visibility" Value="Collapsed" />
</DataTrigger>
<DataTrigger Binding="{Binding IsOverview}" Value="True">
<Setter Property="Style" TargetName="TextBlock_Detail" Value="{DynamicResource LinkButton}" />
<Setter Property="FontWeight" TargetName="TextBlock_Detail" Value="Bold" />
</DataTrigger>
</DataTemplate.Triggers>
</DataTemplate>
</ItemsControl.ItemTemplate>

Answer 1

You should reference on TemplatedParent in Binding:
<StackPanel Background="#293344" Width="200" x:Name="DetailTab" Margin="0">
<TextBlock FontSize="12" Text="{Binding RelativeSource={RelativeSource TemplatedParent}, Path=DataContext.DetailPaneText}" Foreground="White" />
</StackPanel>

Answer 2

If you trying to bind a tooltip text of a button to the Text property of textblock, you may bind it using the ElementName.
First name your button using x:Name
<Button x:Name="XButton">
<Button.ToolTip>
<TextBlock Text="{Binding Path=DetailPaneText}" />
</Button.ToolTip>
</Button>
Bind it to text block text using the ElementName.
<StackPanel Background="#293344" Width="200" x:Name="DetailTab" Margin="0">
<TextBlock FontSize="12" Text="{Binding ElementName=XButton, Path=ToolTip.Text}" />
</StackPanel>