public class InvokeCommandBehavior : Behavior<FrameworkElement>

  <GroupBox Grid.Row="1" Header="Sliding pages">
    <view:SlidingPageControl Grid.Row="4" Grid.ColumnSpan="6"
                             Name="SlidingPageControl"
                             ObjectCollection="{Binding SlidingPageCollection, Mode=TwoWay}"
                             DefaultScrollMode="{Binding DefaultScrollMode}"
                             CustomConfiguration="{Binding TestConfiguration}"
                             SlidingPageHiddenAction="SlidingPageHiddenAction"
                             SlidingPageLoadedAction="SlidingPageLoadedAction"
                             SlidingPageShownAction="SlidingPageShownAction"
                             SlidingPageUnloadedAction="SlidingPageUnloadedAction" >
        <i:Interaction.Behaviors>
            <wsc:InvokeCommandBehavior Event="SlidingPageValidateAction"
                                       Command="{Binding SlidingPageValidateCommand}"
                                       PassArguments="True" />
        </i:Interaction.Behaviors>
    </view:SlidingPageControl>
</GroupBox>

public class SlidingPageValidateCommand : ICommand
{
    public event EventHandler CanExecuteChanged = delegate { };

    public bool CanExecute(object parameter)
    {
        return true;
    }

    public void Execute(object parameter)
    {
        // Check whether the parameter has the correct type to access the
        // needed information.
        if (parameter is EventArgsWrapper wrapper && 
            wrapper.EventArgs is SlidingPageValidateEventArgs slidingPageEventArgs)
        {
            // Get the view model of the sender.
            SlidingPageDialogViewModel viewModel = wrapper.GetSenderViewModel<SlidingPageDialogViewModel>();

            // Add your decision code here.
            // ...
            if (viewModel.DisablePageChange)
            {
                // If changing the sliding page shall be avoided,
                // set the cancel event here.
                slidingPageEventArgs.Cancel = true;
            }
        }
    }
}