DisplayForm problem with $\pi$ in FractionBox

Question

The following line produces an output with the text "Pi" displayed instead of the symbol (greek letter) $\pi$.

Code line:

    FractionBox[π,2] // DisplayForm

All help with an alternative or correction of this would be much appreciated, thank you.

---

Responding to a question below here is an image of how FractionBox enters an equation display. The first line produces an unintended rearrangement of the fraction in the sum. The second line is the intended result. There is no calculation intended, only display.

Here are the code lines

Sum[(-1)^n * StieltjesGamma[n]/n! *
      Subscript[B, n + 1][-I c, 2 x - 1], {0, Infinity}] // Defer // 
   HoldForm // DisplayForm // TraditionalForm

and

Sum[(-1)^n * FractionBox[StieltjesGamma[n], n!] *
      Subscript[B, n + 1][-I c, 2 x - 1], {0, Infinity}] // Defer // 
   HoldForm // DisplayForm // TraditionalForm

Answer 1

Why are you inputting a FractionBox? There should not be any need to do so. However, if you must do this, you should generate the boxes using MakeBoxes instead:

MakeBoxes[π/2]

FractionBox["π", "2"]

Update

For the follow on question presented as an answer, i would use Divide instead of FractionBox:

Sum[
    (-1)^n Divide[StieltjesGamma[n],n!] Subscript[B,n+1][-I c,2 x-1],
    {0,Infinity}
] //Defer //TraditionalForm

Answer 2

Just discovered this:

Not very satisfying, but works. Better alternatives would be still appreciated, thank you.