jQuery Grid Plugin - jqGrid

when i set this two option to be on, i find that there is a bug

multiselect: true

cellEdit: true

For example i click for checkbox for two rows (p.s. not the checkall box),

if no cellEdit: true, when i try to use
jQuery("#list").getGridParam('selarrrow'), it return the value i want

however, if i set cellEdit:true, the value return ""

if i click the checkall, it also return the value i want. So i guess there is something wrong if we combine multiselect and cellEdit together.