If you have a Text Area control on a mobile device, it can be difficult to scroll the text in the text area without scrolling the Panel that contains the Text Area.
On iOS devices you can scroll the text in the Text Area using a two finger drag. However, this is a cumbersome and not obvious gesture.
The TextArea-Mobile-Scrollable control is a pre-defined control is available to create a Text Area optimized for mobile devices.
The image below shows the Text control with a special slider on the right hand side that will allow you to easily scroll the text in the Text Area control.