Supports iOS, Android and UWP. Define three private instance fields: GridView, CustomAdapter and JavaList objects. We can set it to anything we want to show, such as back, return, etc. User169828 posted. Hi all, I need an urgent help please. We'll be implementing the code, which allows us to open the File Picker. If the user clicks a single ListView, item, we handle the itemclick event and show a toast message. We can use dialogs to show a confirmation message, to indicate when the app is working or even display a rich input form that appears over our main user interface. For internal use by the Xamarin.Forms platform. Found inside â Page 39Forms Fundamentals Dan Hermes, Nima Mazloumi.