Occurs before a component displays a drop-down window.
The event applies to the following components:
TcxMRUEdit components use the drop-down window to let users specify the desired value. The
OnPopup event occurs when the window is about to be opened. Write an
OnPopup event handler to perform specific actions before the drop-down window becomes visible.
The event has the following parameter:
When the drop-down window is about to be displayed, events occur in the following order: