The image below shows the expression editor in the AutoComplete mode:
The AutoComplete mode supports intelligent code completion, syntax highlighting and immediate error indication. Refer to the Expression Editor Capabilities topic to learn more.
The expression editor in AutoComplete mode is an ExpressionEditorControl class instance that is included in the DevExpress.Xpf.ExpressionEditor assembly. If the Global Assembly Cache stores this assembly, the AutoComplete mode is used by default.