LyX ⇒ Framing rectangle from xypic

[marogi]

Hi,
I have read (very useful btw) LyX xypic tutorial and I found a feature I would really like to use - namely framing rectangle in \xymatrix. However, to my surprise adding the following line into LyX document (taken directly from tutorial source):

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\save"1,1"."2,1"*+[F=]\frm{}\restore

does not work. No matter how I insert the code (in math editor or full \xymatrix code with LaTeX insert) it displays:

"1,1"."2,1"*+[F-]

both in editor and pdf.
I have added

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\usepackage[all]{xy}

to document preamble.
Do you know any other setting that could affect interpretation of xypic code in LyX?
I am using the latest version of LyX (1.6.7).