Buttons can be clicked either by name or by data-id. The data-ids can be found in the HTML DOM, the labels are just the ones you see in the D365 UI. This should also work for clicking subgrid buttons.

Learn how to design buttons in UI that are clear, consistent, and accessible. Discover the best practices and tips for using labels, colors, size, shape, placement, and testing.

With Android 4.x Ice Cream Sandwich, Google made one very major decision regarding the user-interface: replace physical below-screen buttons on the front of the device with virtual on-screen buttons.