This example demonstrates how to customize the SearchLookUpEdit popup appearance.
All popup controls inherited from RepositoryItemPopupBase has the AppearanceDropDown property that represent the appearance settings used to paint the editor's popup window.
The AppeareanceDropDown property works only for simple popup windows. The popup windows in SearchLookUpEdit and GridLookUpEdit do not use this property because they has complex layouts.
The SearchLookUpEdit popup window contain LayoutControl. To customize its appearance handle the Popup event. In this event handler obtain PopupWindow and iterate through its controls to find the required LayoutControl. Then, customize its appearance.