How to fire a textbox command upon losing focus in WPF?

Question

The following template works fine if the user presses Enter, although I want the command to fire when the TextBox loses focus as well. How can I do this?

Answer 1

If you don't use any MVVM framework you could use InvokeCommandAction from System.Windows.Interactivity to execute command when event is fired

<TextBox ...>
    <i:Interaction.Triggers>
        <i:EventTrigger EventName="LostFocus">
            <i:InvokeCommandAction 
                Command="{Binding RelativeSource={RelativeSource FindAncestor, AncestorType=DataGrid}, Path=DataContext.RenameCommand}" 
                CommandParameter="{Binding}"/>
        </i:EventTrigger>
    </i:Interaction.Triggers>
</TextBox>

you'll need to add reference to System.Windows.Interactivity and add namespace in your XAML:

xmlns:i="http://schemas.microsoft.com/expression/2010/interactivity"