for {set i 0} {$i < $l} {incr i 2} {
${button}.m add command -label [lindex $names $i] \
-command [list listbuttonv-action $button $var $names $i]
for {set i 0} {$i < $l} {incr i 2} {
${button}.m add command -label [lindex $names $i] \
-command [list listbuttonv-action $button $var $names $i]