Cycle Selection
Select Cycle Selection (CTRL + SPACE) on the View | Selection menu, or the Vizex right-click menu, to cycle the current selection to the next item, in Z order, under the cursor at the time of the selection.
If multiple items do not exist under the cursor at the time of the selection, the Cycle Selection option is disabled on the View | Selection menu, and is omitted from the right-click menu.
Click on the following image to see an animated example of a cycle selection in Vizex: