Indesign CS4 Javascript 容器编组/取消编组

//将所选容器编组
if(app.selection.length > 1)
{
       var myPage = app.selection[0].parent;
       var myArray = new Array();
       for(var i = 0; app.selection.length > i; i++)
       {
             myArray.push(app.selection[i]);
       }
       var myGroup = myPage.groups.add(myArray);
       app.selection = myGroup;
}

//将所选容器取消编组
myGroup.ungroup();