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I wanted to create a window, with several tabs interface in it
I think you'll have to make this yourself. This is a fairly simple process of creating your tabs on a few successive pages & simply linking the pages via clicks on their tabs -- not a big deal to do. I'm not surprised it isn't "hard-wired" into Opus, as there are so many possible variations on what users need to do with tabs (how the tabs look, how many are needed, their horizontal/vertical orientation, etc.) -- and yet for all of this variation, outside of Help files the "Tab approach" is not used all that frequently in most screen navigation. (BTW: If memory serves, wasn't there -- at one time, long ago -- an example of a tabbed screen?)
There are now so many object options in Opus that, until this thread, I had thought it was starting to look as if there is an object-creation button for every imaginable object in the familiar PC universe.