Hi Francisco,
Actually, this part of GridViewHeaderRow is called GridViewIndentCell. However, the behavior you experience is a bit strange and it is not the default one.
I have prepared an example for you following the structure from the attached picture and everything works as expected on my side. Please check the attached project and let me know how it differs from yours.
All the best,
Vanya Pavlova
the Telerik team
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