WPF revalidate the object on any property change [Answered]

<DataGridTemplateColumn Header="Has Owner">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <CheckBox
                local:Properties.Focus="True"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                IsChecked="{Binding HasOwner, Mode=TwoWay, ValidatesOnDataErrors=True}"
                />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
    
<DataGridTemplateColumn Header="Owner First Name">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBox
                local:Properties.Focus="True"
                Text="{Binding Owner_FirstName, Mode=TwoWay, ValidatesOnDataErrors=True}"
                IsEnabled="{Binding HasOwner}"
                Validation.ErrorTemplate="{StaticResource validationTemplate}"
                />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>

<DataGridTemplateColumn Header="Has Owner">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <CheckBox
                local:Properties.Focus="True"
                HorizontalAlignment="Center"
                VerticalAlignment="Center"
                IsChecked="{Binding HasOwner, Mode=TwoWay, ValidatesOnDataErrors=True}"
                />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>
    
<DataGridTemplateColumn Header="Owner First Name">
    <DataGridTemplateColumn.CellTemplate>
        <DataTemplate>
            <TextBox
                local:Properties.Focus="True"
                Text="{Binding Owner_FirstName, Mode=TwoWay, ValidatesOnDataErrors=True}"
                IsEnabled="{Binding HasOwner}"
                Validation.ErrorTemplate="{StaticResource validationTemplate}"
                />
        </DataTemplate>
    </DataGridTemplateColumn.CellTemplate>
</DataGridTemplateColumn>