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because it might contain thousands of elements. Parts of the tree are built as they are needed, and the tree can undergo changes as elements are added, moved, or removed.

Control types

UIA control types are well-known identifiers that can be used to indicate what kind of control a particular element represents, such as a combo box or a button.

Having a well-known identifier allows assistive technology (AT) devices to more easily determine what types of controls are available in the user interface (UI) and how to interact

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