Please excuse me for the late answer.
Unfortunately I was not able, to reproduce the described issue. Here you can see a short screen cast of my test with Ranorex. Also in the begging of the screen cast you can see the code of the sample application I used. It contains a RadTabControl with four RadTabItems and from the screen cast you can see that Ranorex see all the parts of the RadTabControl and RadControItems.
Please examine the video and if you have more questions don't hesitate to contact us.
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