When you want to add a GUI control to the artboard, you could hunt for a given item on your

Tools panel. However, remember that the Tools panel shows you only a selection of commonly

used UI controls, grouped by category. If you take a moment to examine your options, you’ll see

that the Tools panel has groups for layout managers, text controls (Label, TextBox, etc.), and

basic user input controls (Button, Slider, ListBox, and so on). See the following figure :

When you want to see the full set of UI controls, access the Assets panel (or the Assets
library, located on your Tools panel). Here you can see all possible controls by looking under
the All section of the Controls category.