have a look at the attached demofile. click on the cells of the first two colums and all lines get lost except the ones from the header.
Herbert -- http://www.lyx.org/help/
#LyX 1.2 created this file. For more info see http://www.lyx.org/ \lyxformat 220 \textclass article \language german \inputencoding latin1 \fontscheme default \graphics default \paperfontsize 10 \spacing single \papersize a4paper \paperpackage a4 \use_geometry 0 \use_amsmath 1 \use_natbib 0 \use_numerical_citations 0 \paperorientation portrait \secnumdepth 3 \tocdepth 3 \paragraph_separation indent \defskip medskip \quotes_language german \quotes_times 2 \papercolumns 1 \papersides 1 \paperpagestyle default \layout Standard \begin_inset Tabular <lyxtabular version="3" rows="5" columns="3"> <features type="normal" tabwidth="" rotate="false" firstHeadTopDL="false" firstHeadBottomDL="false" firstHeadEmpty="false" headTopDL="false" headBottomDL="false" footTopDL="false" footBottomDL="false" lastFootTopDL="false" lastFootBottomDL="false" lastFootEmpty="false"> <column alignment="center" valignment="top" leftline="true" rightline="false" width="0pt" special=""> <column alignment="center" valignment="top" leftline="true" rightline="false" width="0pt" special=""> <column alignment="center" valignment="top" leftline="true" rightline="true" width="0pt" special=""> <row topline="true" bottomline="true" endhead="false" endfirsthead="false" endfoot="false" endlastfoot="false" newpage="false"> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard Name \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard Funktion \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="true" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard Beispiel \end_inset </cell> </row> <row topline="true" bottomline="false" endhead="false" endfirsthead="false" endfoot="false" endlastfoot="false" newpage="false"> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard abs \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard Absolutwert \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="true" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard \begin_inset Formula $-3$ \end_inset \SpecialChar ~ abs\SpecialChar ~ \begin_inset Formula $\rightarrow 3$ \end_inset \end_inset </cell> </row> <row topline="true" bottomline="false" endhead="false" endfirsthead="false" endfoot="false" endlastfoot="false" newpage="false"> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard add \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard Addition \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="true" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard \begin_inset Formula $5$ \end_inset \SpecialChar ~ \begin_inset Formula $7$ \end_inset \SpecialChar ~ add\SpecialChar ~ \begin_inset Formula $\rightarrow 12$ \end_inset \end_inset </cell> </row> <row topline="true" bottomline="false" endhead="false" endfirsthead="false" endfoot="false" endlastfoot="false" newpage="false"> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard atan \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard arcus tangens \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="true" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard \begin_inset Formula $2$ \end_inset \SpecialChar ~ \begin_inset Formula $45$ \end_inset \SpecialChar ~ \begin_inset Formula $atan\rightarrow 2.5448$ \end_inset \end_inset </cell> </row> <row topline="true" bottomline="true" endhead="false" endfirsthead="false" endfoot="false" endlastfoot="false" newpage="false"> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="false" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard \end_inset </cell> <cell multicolumn="0" alignment="center" valignment="top" topline="true" bottomline="false" leftline="true" rightline="true" rotate="false" usebox="none" width="0pt" special=""> \begin_inset Text \layout Standard \end_inset </cell> </row> </lyxtabular> \end_inset \the_end
