From Xojo Documentation
| This class is supported on Mobile.
Use ＃If...＃Endif with the Target... constants to ensure you only use this class where it is supported.
A MobileContainer is a way to create a group of controls that are treated as a single control. It is a great way to simplify complex screens. In addition, with MobileContainer, you can create reusable controls to include on multiple screens or even other MobileContainers.