MIST markerRemove

[Flasher]

Hi I've a question  why the script is working using a polygon and not with a line ?

FORM1 = mist.marker.drawShape('ellipse')

mist.marker.remove(FORM1)

Working the ellipse is drawn and removed

FORM2 = mist.marker.drawShape('line')

mist.marker.remove(FORM2)

NOT working the line is drawn, but not removed