DevStudent

By default every pivot app contains a long list selector with row template i.e., items inside it will be displayed in listview format. Now in this example i modified the xaml code to convert that list format to grid format using the below code.

In this example i created windows phone 8 app using C#/XAML pivot template.
Here is the modified code in MainPage.xaml to display first pivot item longlistselector items in grid format.

<phone:PhoneApplicationPage
    x:Class="PivotApp1.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"
    mc:Ignorable="d"
    d:DataContext="{d:DesignData SampleData/MainViewModelSampleData.xaml}"
    FontFamily="{StaticResource PhoneFontFamilyNormal}"
    FontSize="{StaticResource PhoneFontSizeNormal}"
    Foreground="{StaticResource PhoneForegroundBrush}"
    SupportedOrientations="Portrait"  Orientation="Portrait"
    shell:SystemTray.IsVisible="True">

    <!--LayoutRoot is the root grid where all page content is placed-->
    <Grid x:Name="LayoutRoot" Background="Transparent">

        <!--Pivot Control-->
        <phone:Pivot Title="MY APPLICATION">
            <!--Pivot item one-->
            <phone:PivotItem Header="first">
                <!--Double line list with text wrapping-->
                <phone:LongListSelector LayoutMode="Grid" GridCellSize="180,180" 
                                        
                                        Margin="0,0,-12,0" ItemsSource="{Binding Items}">
                    <phone:LongListSelector.ItemTemplate>
                        <DataTemplate>
                            <Grid Background="{StaticResource PhoneAccentBrush}" Margin="5">
                            <StackPanel>
                                <TextBlock Text="{Binding LineOne}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                                <TextBlock Text="{Binding LineTwo}" TextWrapping="Wrap"  Style="{StaticResource PhoneTextSubtleStyle}"/>
                            </StackPanel>
                            </Grid>
                        </DataTemplate>
                    </phone:LongListSelector.ItemTemplate>
                </phone:LongListSelector>
            </phone:PivotItem>

            <!--Pivot item two-->
            <phone:PivotItem Header="second">
                <!--Double line list no text wrapping-->
                <phone:LongListSelector Margin="0,0,-12,0" ItemsSource="{Binding Items}">
                    <phone:LongListSelector.ItemTemplate>
                            <DataTemplate>
                                <StackPanel Margin="0,0,0,17">
                                    <TextBlock Text="{Binding LineOne}" TextWrapping="NoWrap" Margin="12,0,0,0" Style="{StaticResource PhoneTextExtraLargeStyle}"/>
                                    <TextBlock Text="{Binding LineThree}" TextWrapping="NoWrap" Margin="12,-6,0,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
                                </StackPanel>
                            </DataTemplate>
                    </phone:LongListSelector.ItemTemplate>
                </phone:LongListSelector>
            </phone:PivotItem>
        </phone:Pivot>

    </Grid>

</phone:PhoneApplicationPage>