Mine

$ifequal($strcmp($getpvar(Br Hide),1),0,
$drawrect(0,$sub(%_height%,109),%_width%,9,brushcolor-syscol-15)
$button2($sub(%_width%,26),$sub(%_height%,108),0,0,24,6,Hide,Hide,'PVAR:SET:Br Hide:1',TOOLTIP:Hide Browser Panels)
$panel(Browser A,Browser Panel,0,$get(Br. Y),$eval(%_width%/3),$get(Br. Sz Y),)
$panel(Browser B,Browser Panel,$eval(%_width%/3),$get(Br. Y),$eval(%_width%/3),$get(Br. Sz Y),)
$panel(Browser C,Browser Panel,$eval(%_width%/3*2),$get(Br. Y),$eval(%_width%/3),$get(Br. Sz Y),)
,
$drawrect(0,$sub(%_height%,9),%_width%,9,brushcolor-syscol-15)
$button2($sub(%_width%,33),$sub(%_height%,8),0,0,33,6,Show,Show,'PVAR:SET:Br Hide:0',TOOLTIP:Show Browser Panels)
)