Parenthesize accidental together

[Venus' Wink]

Hi,

I'd like to output like the attachment purpose.png.
But the following simple code

    \parenthesize ces''4

puts the flat symbol out of the parens (with Lilypond 2.18.2).

I think that overriding the stencil of the left paren will make it so,
but I couldn't find the name of the stencil.

Or, is there more elegant way?

Thanks
Venus' Wink

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purpose.png
Description: PNG image