Activate the TAB key in the dialog box with the blue button toggle

I do not know if you are using Mac OS there is no confusion, after the dialog box can not use the tab to switch options. So many people think that the Mac even this kind of egg pain but practical small function is not, in fact, we have to set up on it. Scene Recurrence:

If you do not use the mouse or touch pad you can only turn off the machine, but the hands are lazy how to do. STEP1: System Preferences-"all controls" selected in the keyboard

STEP2: Try again:

This time to see the blue box, you can select the contents of the virtual box, and the return or blue Highlight button, press TAB to switch, plus press Shift can go backwards, so the problem is solved.

Edit add: You can also activate or turn off the tab selection function by Ctrl + F7 when a button appears.