How Can I styled ToolTip and share the TextBlock?

[Flithor]

I want to styled bellow TextBox ToolTip into WithCustomToolTip.

<!-- the WithCustomToolTip class style defined in parent styles -->

<TextBox Classes="WithCustomToolTip" x:Name="MyTextBox">
    <Style Selector="ToolTip">
        <Setter Property="Background" Value="#2D2D2D" />
        <Setter Property="MaxWidth" Value="NaN" />
        <Setter Property="Width" Value="{Binding #MyTextBox.Bounds.Width}" />
    </Style>
 
    <ToolTip.Tip>
        <TextBlock>Some <Bold>rich</Bold> text here.</TextBlock>
    </ToolTip.Tip>
</TextBox>

[Flithor]

I have done it, for who comes latter:

<ParentControl.Styles>
    <Style Selector="TextBox.WithCustomToolTip">
        <!-- Some setter-->
        <!-- Explicitly set ToolTip.Tip, event the empty string-->
        <Setter Property="ToolTip.Tip" Value="" />

        <!-- Nested styles for ToolTip-->
        <Style Selector="^ ToolTip">
            <Setter Property="Background" Value="#2D2D2D" />
            <Setter Property="MaxWidth" Value="NaN" />

            <!-- change to from parent -->
            <Setter Property="Width" Value="{Binding $parent[TextBox].Bounds.Width}" />

            <!-- use ContentTemplate to share TextBlock Control -->
            <Setter Property="ContentTemplate">
                <DataTemplate DataType="{x:Null}">
                    <TextBlock>Some <Bold>rich</Bold> text here.</TextBlock>
                </DataTemplate>
              </Setter>
        </Style>
    </Style>
</ParentControl.Styles>

[Bobsoftru]

Thank you, I came . Now tell me how to open the tooltip only if there is an overflow
<TextBlock ToolTip.Tip="{Binding name}" TextTrimming="CharacterEllipsis" Margin="5 0" Grid.Row="0" Grid.Column="1" Text="{Binding name,Mode=OneWay}"/>

[Flithor]

@Bobsoftru Ask in a new question, not ask me.