Statistical query

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<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="ArcGISRuntime.Samples.StatisticalQuery.StatisticalQuery"
             xmlns="http://xamarin.com/schemas/2014/forms"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Xamarin.Forms;assembly=Esri.ArcGISRuntime.Xamarin.Forms">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition />
        </Grid.RowDefinitions>
        <Grid>
            <Grid.RowDefinitions>
                <RowDefinition />
                <RowDefinition />
                <RowDefinition />
            </Grid.RowDefinitions>
            <Grid.ColumnDefinitions>
                <ColumnDefinition />
                <ColumnDefinition Width="3*" />
            </Grid.ColumnDefinitions>
            <Switch x:Name="OnlyInExtentSwitch"
                    Grid.Row="0"
                    Grid.Column="0"
                    HorizontalOptions="End" />
            <Label Grid.Row="0"
                   Grid.Column="1"
                   Margin="10,0"
                   Text="Cities in current extent"
                   VerticalOptions="Center" />
            <Switch x:Name="OnlyBigCitiesSwitch"
                    Grid.Row="1"
                    Grid.Column="0"
                    HorizontalOptions="End" />
            <Label Grid.Row="1"
                   Grid.Column="1"
                   Margin="10,0"
                   Text="Cities larger than 5M"
                   VerticalOptions="Center" />
            <Button x:Name="GetStatsButton"
                    Grid.Row="2"
                    Grid.Column="0"
                    Grid.ColumnSpan="2"
                    Margin="5,0"
                    Clicked="OnExecuteStatisticsQueryClicked"
                    Text="Get Statistics" />
        </Grid>

        <esriUI:MapView x:Name="MyMapView" Grid.Row="1" />
        <Grid x:Name="ResultsGrid"
              Grid.Row="1"
              BackgroundColor="Gainsboro"
              IsVisible="False">
            <Grid.RowDefinitions>
                <RowDefinition Height="auto" />
                <RowDefinition Height="50" />
            </Grid.RowDefinitions>
            <ListView x:Name="StatResultsList" />
            <Button Grid.Row="1"
                    Margin="5"
                    Clicked="HideResults"
                    Text="Dismiss" />
        </Grid>
    </Grid>
</ContentPage>