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ControlName_UserMessage ( uiMsg)
Occurs when an application component posts a user-defined UIMessage. A user-defined user interface message has an event code value that is equal to or greater than UIMsg_UserMessageBase (value: 10000).
The Application Manager control automatically acknowledges the user message when this event completes. Therefore, you do not have to directly call the UIMessage.Acknowledge method from within this event.
uiMsg As UIMessage
[In] Specifies the user-defined UIMessage object.