Selecting chart elements using the cursor keys
You can use the cursor keys to cycle through the elements in a chart. The up and down keys move through the main elements whilst the left and right can be used to move through the items in a element.
Starting with a chart that has its chart area selected a press of the up arrow would then select....
With an element selected use of the right arrow would then select an item within that element...
From Legend to Legend Entry
From Data Series to Data Point
From Value axis to Category axis
Some items within an element even have sub items which using the left and right arrows will allow you to select