<Grid RowSpacing="4" ColumnSpacing="4" 
        ColumnDefinitions="*,*"
        RowDefinitions="*,*,*,*,*">

        <Label Text="Row 0, ColumnSpan=2"
            Grid.ColumnSpan="2"
            VerticalOptions="Fill" HorizontalOptions="Fill"
            VerticalTextAlignment="Center" HorizontalTextAlignment="Center"
            Background="#333333" TextColor="White"/>
            

    </Grid>