The DimensionMap properties of TDecisionCube not only control which dimensions and summaries appear but also let you set date ranges and specify the maximum number of dimensions the decision cube may support. You can also indicate whether or not to display data during design. You can display names, (categories) values, subtotals, or data. Display of data at design time can be time consuming, depending on the data source. 

When you click the ellipsis next to DimensionMap in the Object Inspector, the Decision Cube editor dialog box appears. You can use its pages and controls to set the DimensionMap properties. 

The OnRefresh event fires whenever the decision cube cache is rebuilt. Developers can access the new dimension map and change it at that time to free up memory, change the maximum summaries or dimensions, and so on. OnRefresh is also useful if users access the Decision Cube editor; application code can respond to user changes at that time.