Why I see the class name tooltip when I define a style for the tooltips?

Question

I have created a style for a tooltip. This is the style:

<Style TargetType="ToolTip" x:Key="ToolTipDefaultStyle">
    <Setter Property="ToolTipService.ShowOnDisabled" Value="true"/>
    <Setter Property="ToolTipService.InitialShowDelay" Value="{StaticResource TooltipInitialShowDelay}"/>
    <Setter Property="ToolTipService.ShowDuration" Value="{StaticResource TooltipDisplayTime}"/>
    <Setter Property="ContentTemplate">
        <Setter.Value>
            <DataTemplate>
                <StackPanel>
                    <TextBlock Text="{Binding RelativeSource={RelativeSource AncestorType=ToolTip}}" TextWrapping='Wrap'
                               Margin="10"/>
                </StackPanel>
            </DataTemplate>
        </Setter.Value>
    </Setter>
</Style>

And this is I use it in a control:

<StackPanel ToolTip="{Binding MyViewModelProperty}">
    
    ..........

    <StackPanel.Resources>
        <Style TargetType="ToolTip" BasedOn="{StaticResource ToolTipDefaultStyle}"/>
    </StackPanel.Resources>
</StackPanel>

The problem is that tooltip, at the start, it shows this text: "System.Windows.Controls.ToolTip". After that, it shows the text I want to show.

How could avoid to show this first text?

What I want to have is a style for all the controls of the application.

Thanks.

Answer 1

The ToolTip control is a ContentControl. The ContentTemplate's DataContext will be the Content property.

So you just need to change your TextBlock binding to:

<TextBlock
    Margin="10"
    Text="{Binding}"
    TextWrapping="Wrap" />