jqGrid - editCell not allows edit?

I spend an hour or two to figure out I forgot to return true in an empty beforeSelectRow event I had added, and this made the grid didn't allow cell editing...

Hope it may saves you a bit of times.

BTW, if you're looking for how to change the column editable in run time, here is an example:

var grid1 = $('#grid1');   
    grid1.jqGrid({
...
colNames:[ 
            'name','note','new'
 ], 
 colModel:[
{name:'name',index:'name',editable=false},
{name:'note',index:'note',editable=true},
{name:'new',index:'new',editable=false}
],
cellEdit:true,
cellsubmit: 'clientArray',
...

beforeSelectRow : function(rowid) {        
            var data = grid1.jqGrid('getRowData', rowid);
            var cm = grid1.jqGrid('getColProp','note'); 

            cm.editable = (data.new=='Y') ? true:false; //'note' will be allowed to edit if 'new' is 'Y'
            return true;
        },