This article is for those who test a desktop application via UI Automation library. Since desktop applications are frequently built using UI controls from different vendors and the number of such controls available on the market is pretty big (> 1k) - Rapise may not have out-of-the-box support for some controls in your application. For such cases Rapise offers a low level API to navigate UI Automation tree of elements inside an application and read/write element properties. In this tutorial we'll show how to use this API and quickly add minimal support for a custom control.