Hi, \def\pack_layers_set[#1][#2][#3]% #4 == box do \fi is ok {\bgroup \edef\currentlayer{#1}% - \edef\p_pack_layers_state{\layerparameter{#1}\c!state}% + \edef\p_pack_layers_state{\layerparameter\c!state}% \ifx\p_pack_layers_state\v!stop \dowithnextboxcs\egroup\hbox \else\ifthirdargument \pack_layers_set_indeed[#1][#2][#3]% \else \doifassignmentelse{#2} {\pack_layers_set_indeed[#1][][#2]}% {\pack_layers_set_indeed[#1][#2][]}% \fi\fi} Wolfgang