MainPage.xaml

<phone:PhoneApplicationPage 
    x:Class="Projeto_WP7___Igor_Amorim_C.Portela.MainPage"
    xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation"
    xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml"
    xmlns:phone="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone"
    xmlns:shell="clr-namespace:Microsoft.Phone.Shell;assembly=Microsoft.Phone"
    xmlns:d="http://schemas.microsoft.com/expression/blend/2008"
    xmlns:mc="http://schemas.openxmlformats.org/markup-compatibility/2006"
    xmlns:controls="clr-namespace:Microsoft.Phone.Controls;assembly=Microsoft.Phone.Controls"
    mc:Ignorable="d" d:DesignWidth="480" d:DesignHeight="768"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait" Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <controls:Pivot Title="Bubbles" Name="pivotGame">
        <controls:PivotItem Name="main_screen" Header="Menu">
            <StackPanel Margin="0 140">
                <Button Name="btnPlay" Click="btnPlay_Click" Height="81" Width="211">Jogar</Button>
                <Button Name="btnRanking" Click="btnRanking_Click" Height="86" Width="206">Ver ranking</Button>
            </StackPanel>
        </controls:PivotItem>

        <controls:PivotItem Name="game_screen" Header="Jogo">
            <StackPanel>
                <TextBlock Name="Nivel" Text="{Binding nivel}"/>
                <TextBlock Name="Pointing" Text="{Binding pointing}"/>
                <TextBlock Name="Lifes" Text="{Binding lifes}"/>
                <Canvas Name="contentPanel" Height="580" Margin="10"></Canvas>
            </StackPanel>
        </controls:PivotItem>

        <controls:PivotItem Name="ranking_screen" Header="Ranking">
            <ListBox Name="lstRanking">
            </ListBox>
        </controls:PivotItem>
    </controls:Pivot>

</phone:PhoneApplicationPage>