Hi Daniele Dalla Valle,
Thank you for contacting us.
I was able to reproduce the reported issues and they will be addressed in one of our next versions. For the time being, however, there is no workaround that will allow you to set the desired properties at design-time. The code snippet below demonstrates how to set the properties programmatically:
.tabItem1.TextImageRelation = TextImageRelation.TextBeforeImage;
.tabItem1.Children.Children.AngleTransform = 0;
Your Telerik points have been updated for the report. Let me know if you have other questions.
All the best,
the Telerik team
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