Write an OnAfterPivot event handler to take specific action after the information provided by the decision source changes but before any decision controls are updated to reflect the change. This is a good opportunity to save information about the pivot state. 

When the pivot state of the decision source changes, an OnBeforePivot occurs when the results of the change have been calculated, and OnAfterPivot occurs when the decision source has been updated to reflect the change. Once the decision controls that are linked to the decision pivot are updated to reflect the change, an OnLayoutChange event occurs. 

OnBeforePivot 

OnLayoutChange 

OnNewDimensions 

OnStateChange 

TDecisionPivot 

Using Decision Sources