curve visibility toggle mel

string $myPanel = `getPanel -wf`;

if(`getPanel -to $myPanel` == "modelPanel") {
if(`modelEditor -q -nurbsCurves $myPanel` == 0) {
modelEditor -e -nurbsCurves 1 $myPanel;
}
else {

modelEditor -e -nurbsCurves 0 $myPanel;
}
}