MainPage.xaml

<?xml version="1.0" encoding="UTF-8"?>
<ContentPage xmlns="http://xamarin.com/schemas/2014/forms" 
             xmlns:x="http://schemas.microsoft.com/winfx/2009/xaml" 
             x:Class="UberClone.Views.MapPage" >
    <Grid RowSpacing="0"
          x:Name="layout"
          VerticalOptions="FillAndExpand"
          RowDefinitions="Auto, *">
        ...
        <local:SearchContentView IsVisible="false" 
                                 Grid.Row="1" 
                                 x:Name="searchContentView">
             <local:SearchContentView.Triggers>
                <DataTrigger TargetType="local:SearchContentView"
                             Binding="{Binding State}"
                             Value="{x:Static helpers:XUberState.SearchingDestination}">
                     <Setter Property="IsVisible" Value="True"/>
                </DataTrigger>
            </local:SearchContentView.Triggers>
        </local:SearchContentView>
    </Grid>
</ContentPage>