ManageBookmarks.xaml

<?xml version="1.0" encoding="utf-8" ?>
<ContentPage x:Class="ArcGIS.Samples.ManageBookmarks.ManageBookmarks"
             xmlns="http://schemas.microsoft.com/dotnet/2021/maui"
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml"
             xmlns:esriUI="clr-namespace:Esri.ArcGISRuntime.Maui;assembly=Esri.ArcGISRuntime.Maui">
    <Grid>
        <Grid.RowDefinitions>
            <RowDefinition Height="auto" />
            <RowDefinition Height="*" />
        </Grid.RowDefinitions>
        <HorizontalStackLayout Padding="5" Spacing="5">
            <Label HorizontalTextAlignment="Center"
                   Text="Bookmark:"
                   VerticalTextAlignment="Center" />
            <Picker x:Name="BookmarkPicker"
                    ItemDisplayBinding="{Binding Path=Name}"
                    SelectedIndexChanged="BookmarkPicker_SelectedIndexChanged"
                    VerticalOptions="CenterAndExpand"
                    WidthRequest="200" />
            <Button x:Name="ButtonAddBookmark"
                    Margin="5"
                    Clicked="ButtonAddBookmark_Clicked"
                    Text="New" />
        </HorizontalStackLayout>
        <esriUI:MapView x:Name="MyMapView" Grid.Row="1" />
    </Grid>
</ContentPage>