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At the top of the designer, just below the file tabs, is a drop down letting you browse the widgets on a window. On OS X, clicking on this drop down results in different behavior and I'm unable to identify a pattern. This behavior does not occur on Windows.
Sometimes, it will work as expected (show the drop down on a click and then keep it open until you either choose a widget or click on another element). In other cases, a click will show the drop down and then the drop down will be immediately hidden. And in other cases, it will show the drop down and keep it open, but clicks on the widgets in the drop down simply hide the drop down (the widget you selected is not selected in the UI designer).
As not all UI elements are easily selectable from the "live UI" in the designer (for instance, Alignment containers), this can be quite frustrating.
*** This bug has been marked as a duplicate of bug 1217 ***