There are basically three major events that happen within the SAP-delivered component WDR_TEST_UI_ELEMENTS. The first event – the initial display – occurs when someone chooses to run the component. The second event occurs when someone chooses an action link from one of the trays on the lefthand side of the display. The third event occurs when someone chooses a node in the navigation tree on the righthand side of the display. What the component actually executes for these three events can be graphically charted as shown below. If you follow the steps hierarchically, you’ll see what’s what. Note that Step 9 is the same as Step 6, and that Step 12 is the same as Step 6.4. This is because the developers of this component use the same code to initialize what’s displayed the first time around, and to change what’s displayed as the customer makes different selections within the display.