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ActiveX controls can be programmed to respond to events. You can use ControlEvents in properties to view the events that are available in a control and to create event handlers. Event handling is commonly done to trap changes in the data source query. Changes include:

  • Implementing a lookup. When a control (like a DBCombo box) changes value, the change event is trapped to update a data control's query.

  • Implementing a master detail relationship. Two data controls are added to a dialog box, one for the master portion and a second for the detail portion. Whenever the first data source changes, the second data source's query is updated through an event handler.

  • Trapping errors. Most controls have an error event from which you can write an error handler (see Error Trapping).

For more information, see Mapping Messages to Functions.

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