How to add event to the style(resource)?

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I am using this example to do textbox validation. Here is the code.

<Style TargetType="{x:Type TextBox}">
        <Setter Property="Validation.ErrorTemplate">
            <Setter.Value>
                <ControlTemplate>
                    <DockPanel LastChildFill="True">

                        <TextBlock DockPanel.Dock="Right"
                            Foreground="Orange"
                            Margin="5" 
                            FontSize="12pt"
                            Text="{Binding ElementName=MyAdorner, 
                           Path=AdornedElement.(Validation.Errors)[0].ErrorContent}"
                           >
                        </TextBlock>

                        <Border BorderBrush="Green" BorderThickness="3">
                            <AdornedElementPlaceholder Name="MyAdorner" />
                        </Border>

                    </DockPanel>
                </ControlTemplate>
            </Setter.Value>
        </Setter>
        <Style.Triggers>
            <Trigger Property="Validation.HasError" Value="true">
                <Setter Property="ToolTip"
                    Value="{Binding RelativeSource={RelativeSource Self}, 
                   Path=(Validation.Errors)[0].ErrorContent}"/>
            </Trigger>
        </Style.Triggers>
    </Style>

</Application.Resources>

Now I am going to add a mouse click even to it. Also I want to move this style to the a separate style file.

The question is that resource file can't have event in it. How?

What I have tried:

Find this one.
But it seems to use code behind something like. It might be okay. However I want the template can be re-useful.

Posted 21-Nov-17 13:14pm

Member 12658724

Updated 21-Nov-17 19:04pm

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Graeme_Grant · Accepted Answer · 2017-11-21T19:04:00

There are a number of different types of Triggers that you can use. In your example, you are using a Data Trigger. For Event, you need to use an EventTrigger.

I wrote an WPF article earlier this month about a ToggleSwitch control. In it I share an example of replicating the Notification Settings screen from Windows 10. In the article XAML code snippet I show how to use the EventTrigger for MouseOver. This is an ideal example for you: Flexible WPF ToggleSwitch Lookless Control in C# & VB[^] - download the code and you can see how it works.