I'm trying to work with the new control but with some problems related with the radProgressBarElement item (Visibility property).
When I set the Visibility property to Hidden, and then resize the form, the progress bar appear again. I have test this on your sample application for the status bar. I have solved this problem with the SizeChanged event on the main form. On the other hand, each time I try to hidde the progress bar item is not working well (it is hidden and suddenly is visible again). Do you have any idea about this wrong behaviors?