Can you describe in more details what kind of control are you trying to imitate?
There are ways to customize controls more deeply using widget skins. This is the method used in various stencils like iOS, Android, Bootstrap and Foundation, each of them requiring a slightly different look. For example rounded borders is on common requirement. If you are trying to create a reusable control then skinning might be the way to go.
Pavel09 Dec 2015
I am using this as intended - button bar, it's just that no border option would fit the design much better.
I just wanted to know what is the actual UI element in your actual UI
framework that you are trying to emulate. How about using the Link Bar
widget? It sounds like it should work for your no-border use case. Let
me know if it does.