System Functions

When you call Set Data Dictionary Item, Set Data Dictionary Override, or Load From Cache, runtime clears the control of its current items prior to loading any new data specified by the system function call. This is not only true of combo boxes on a form, but in a grid as well. If the new data dictionary item associated with the system function call or associated UDC override results in a change from the current DD Item and/or UDC specified for the grid control, then runtime removes all list items from all embedded combo box controls for all current rows of the column, except for the default -- Select One -- prompt. If this action results in a new set of UDC values, then runtime loads those values into every current embedded combo box control for all of the rows in the grid or Parent Child control.