How can I change color of the bottom line.

[Mikiya Sato]

Hi,
I would like to change border color. 
I can change the tab border. but I can not change the bottom border. How to change it?

[Petar Mladenov]

Hi Mikiya Sato,

In order to change this Border , you can edit the Control Template of the RadTabControl.  Then you can change the Borders inside the  LayoutTransformControl named HeaderDockedElement. Please try the attached project where the described approach is implemented and let me know if it satisfies you completely.
 
Kind regards,
Petar Mladenov
the Telerik team