Allow different width tab headers. For example, 200, 100, 100.
Available in minor release 2018.2.727.250. It will also be available in the R3 2018 release.
Actually there is an issue in RadTabView which prevents the WidthRequest of the TabViewHeaderItem to be respected. So, I've updated this feedback item to be of Bug Report type.
This would be a great addition to the TabView control as I require this functionality.