Linear Navigation doesn't set Active view

Linear Navigation doesn’t set Active view

<App Theme="Basic">
    <DockPanel>
        <StatusBarBackground Dock="Top"/>
        <Panel Dock="Fill">
            <LinearNavigation ux:Name="_appName" Active="Signup"/>
            <Text ux:Class="Titles" FontSize="55" />
            <Text ux:Class="Large" FontSize="40" />
            <Text ux:Class="Medium" FontSize="20" TextAlignment="Center"/>
            <Text ux:Class="Small" FontSize="10" />
            <Page ux:Class="AppPage" ClipToBounds="true">
                <EnteringAnimation>
                    <Move X="-1" Duration="0.5"/>
                </EnteringAnimation>
                <ExitingAnimation>
                    <Move X="1" Duration="0.5"/>
                </ExitingAnimation>
            </Page>

            <!-- Intro -->
            <AppPage ux:Name="Intro">
                <PageIndicator Navigation="_intro" Alignment="BottomCenter" Margin="0,0,0,-680">
                    <Circle ux:Generate="Factory" ux:Binding="DotFactory" Width="15" Height="15" Margin="6">
                        <SolidColor ux:Name="color" Color="#5AF37C"/>
                        <ActivatingAnimation>
                            <Change color.Color="#fff"/>
                        </ActivatingAnimation>
                    </Circle>
                </PageIndicator>
                <PageControl ux:Name="_intro">

                    <Page Background="#fc0">

                        <StackPanel Alignment="Top">
                            <Medium Value="Skip" Alignment="Right" Margin="0,30,20,0" TextColor="#5AF37C"/>
                        </StackPanel>
                        <StackPanel Alignment="Center" Margin="10,-400,0,0">
                            <Titles Value="Wanderlust" Alignment="Center"  TextColor="#fff" Margin="0,200,0,150"/>
                            <Medium Value="Wanderlust photo scrapbook" TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                            <Medium Value="let's you capture everyday travel moments" TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                        </StackPanel>
                    </Page>

                    <Page Background="#0fc">
                        <StackPanel Alignment="Top">
                            <Medium Value="Skip" Alignment="Right" Margin="0,30,20,0" TextColor="#5AF37C"/>
                        </StackPanel>
                        <StackPanel Alignment="Center" Margin="10,-400,0,0">
                            <Titles Value="Wanderlust" Alignment="Center"  TextColor="#fff" Margin="0,200,0,150"/>
                            <Medium Value="By tracking your location " TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                            <Medium Value="we know when you're in a new city" TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                        </StackPanel>
                    </Page>

                    <Page Background="#0cf">
                        <StackPanel Alignment="Top">
                            <Medium Value="Done" Alignment="Right" Margin="0,30,20,0" TextColor="#5AF37C"/>
                        </StackPanel>
                        <StackPanel Alignment="Center" Margin="10,-400,0,0">
                            <Titles Value="Wanderlust" Alignment="Center"  TextColor="#fff" Margin="0,200,0,150"/>
                            <Medium Value="We will send you a reminder to capture " TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                            <Medium Value="a travel moment in every new city" TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                            <Medium Value="you visit" TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                            <Medium Value="Share your travel moments" TextWrapping="Wrap" Alignment="Center" TextColor="#fff" Margin="0,30,0,0"/>
                            <Medium Value="with friends and family" TextWrapping="Wrap" Alignment="Center" TextColor="#fff"/>
                        </StackPanel>
                    </Page>
                </PageControl>
            </AppPage>

            <!-- signup -->
            <AppPage ux:Name="Signup">
                <HierarchicalNavigation Duration="0.5" Easing="QuinticInOut" />
                <StackPanel ux:Name="SignupPage">
                    <Text Value="Hey"/>
                </StackPanel>


            </AppPage>

        </Panel>
    </DockPanel>
</App>

Please I am trying to set the active view but it does’nt work. What am I doing wrong? And why is it wrong

Yes I found the problem… My

<Page ux:Class="AppPage" ClipToBounds="true">
                <EnteringAnimation>
                    <Move X="-1" Duration="0.5" RelativeTo="Size"/>
                    <!-- <Scale Factor="0.5"/> -->
                </EnteringAnimation>
                <ExitingAnimation>
                    <Move X="1" Duration="0.5" RelativeTo="Size"/>
                    <!-- <Scale Factor="0.5"/> -->
                </ExitingAnimation>
            </Page>

        was missing the RelativeTo in its properties. Thanks