Hi,

I tried to use the \underrightarrow Frame decorator from
the math-panel inside of a display formula.

Lyx shows the arrow correctly but latex just
stops with the following error message:

-----------------------------------------------
Undefined control sequence.
 A\underrightarrow
                      {trans}B\]
The control sequence at the end of the top line
of your error message was never \def'ed. If you have
misspelled it (e.g., `\hobx'), type `I' and the correct
spelling (e.g., `I\hbox'). Otherwise just continue,
and I'll forget about whatever was undefined.
-----------------------------------------------

Is this a bug in my latex backend or do I need
an extra package?

I'm running lyx 1.3.4 on a ubuntu/warty linux box. 

A tiny test file showing the error is attachet.

Regards,
  Johannes

Attachment: lyx-error-underrrightarrow.lyx
Description: application/lyx

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