The Data Flow tree displays in a new tabbed view in the IDE. Multiple trees views can be open for the same program but only one can be open for a data item. If you try to run Data Flow Analysis for a data item which is already in the root of the tree, it will be shown in the current tree. If you select a different occurrence of the data item, it will be added as a new tree. In addition, if you make changes to the source code, the currently visible trees will be marked as outdated. Requesting the data item again will create a new tree.
The following list shows some of the different operations that you can perform from the Data Flow Analysis view: