Rotating UI controls
Some of the UI controls can be rotated via the Property Inspector (the label, image, and icon controls, for example), but many can't. If you are used to generic drawing tools this might be surprising. This limitation is intentional, and not due to programming complexity (it's not hard to add technically).
We don't support rotating all controls because we believe that in 90% of cases, it is not needed in wireframes. In fact, adding the ability to rotate any control will likely result in wireframes that are very hard if not impossible to implement by the development team.
If you feel that you need to rotate any other control, let us know and we'll discuss whether to add it together. A workaround would be to rotate a control in a drawing application and then import it as an image.