OptionGroup.EventProcPrefix Property (Access)
Gets or sets the prefix portion of an event procedure name. Read/write String.
Syntax
expression .EventProcPrefix
expression A variable that represents an OptionGroup object.
Remarks
For example, if you have a command button with an event procedure named Details_Click, the EventProcPrefix property returns the string "Details".
Microsoft Access adds the prefix portion of an event procedure name to the event name with an underscore character (_).