Hi You used ( ' ), You must use ( ` ) . Examples 1. if( `checkBox -q -v cb_front` ) polyPlane -w 1 -h 1 -sx 1 -sy 1 -ax 0 1 0 -tx 1 -ch 1; 2. string $sn[]=`ls -sl -dag -type mesh`; 3. float $size = `getAttr polyCube1.width`; print $size; Try this int $panelVis; { // get active panel string $currentPanel = `getPanel -underPointer`; // no panel under pointer --> get panel with focus if ($currentPanel == "") $currentPanel = `getPanel -withFocus`; // get panel display type string $panelType = `getPanel -typeOf $currentPanel`; // get panel name string $currentName = `modelPanel -query -label $currentPanel`; if ($panelType == "modelPanel") { // Toggle grid in correct panel: if($currentName == "Top View") {$panelVis = `modelEditor -q -grid modelPanel1`; if ($panelVis == "0") modelEditor -e -grid 1 modelPanel1; if ($panelVis == "1") modelEditor -e -grid 0 modelPanel1; } if($currentName == "Side View") {$panelVis = `modelEditor -q -grid modelPanel2`; if ($panelVis == "0") modelEditor -e -grid 1 modelPanel2; if ($panelVis == "1") modelEditor -e -grid 0 modelPanel2; } if($currentName == "Front View") { $panelVis = `modelEditor -q -grid modelPanel3`; if ($panelVis == "0") modelEditor -e -grid 1 modelPanel3; if ($panelVis == "1") modelEditor -e -grid 0 modelPanel3; } if($currentName == "Persp View") {$panelVis = `modelEditor -q -grid modelPanel4`; if ($panelVis == "0") modelEditor -e -grid 1 modelPanel4; if ($panelVis == "1") modelEditor -e -grid 0 modelPanel4; } } }