Explain UIObject class.

1.	Explain UIObject class.
Answer» The class UIObject is the superclass for all user-interface objects. It simply wraps a DOM element, and cannot receive events. It provides direct child classes like Widget, MenuItem, MenuItemSeparator, TreeItem. All UIObject objects can be styled using CSS. Every UIObject has a primary style name that identifies the key CSS style rule that should always be applied to it. More complex styling behavior can be achieved by manipulating an object's secondary style names.

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