Formatting Framed - some FrameStyle graphic directives don't work?

Question

The FrameStyle option in Framed seems to work for some graphics directives but not others, eg:

Framed["yo", FrameStyle -> Blue]

But

Framed["??", FrameStyle -> Thickness[0.1]]

and

Framed["??", FrameStyle -> Directive[Thickness[0.1]]]

seem to have no effect (having varied thickness parameter)

Answer 1

It indeed seems that the thickness of the frame doesn't respond to any of the options in Frame. As a workaround, you could do this:

SetOptions[FrameBox, BoxFrame -> 3]; 
Framed["AA", FrameStyle -> Red]

However, the SetOptions will affect all frames drawn in your notebook (even ones that have been drawn before).

A more customizable approach would be to use the lower level FrameBox directly. This is shown here - using the ability of BoxFrame to specify thicknesses of all sides individually:

FrameBox["AA", FrameStyle -> Red, 
  BoxFrame -> {{1, 4}, {1, 1}}] // DisplayForm