(javascript) I want to group in existing pathitem

Question

<ai cs5><javascript>
I creat 5 pathitem in the K_layer, i want to group them.
code:
        var myDoc =  app.activeDocument;       
        var K_layer = myDoc.layers.add();
        var k01 = K_layer.pathItems.add();  k01.name='01';
        var k02 = K_layer.pathItems.add();  k02.name='02';
        var k03 = K_layer.pathItems.add();   k03.name='03';
        var k04 = K_layer.pathItems.add();  k04.name='04';
        var k05 = K_layer.pathItems.add();  k05.name='05';
        var mygroup = K_layer.groupItems.add();
        for (var i=0; i<K_layer.pathItems.length; i++)
                K_layer.pathItems[i].move(mygroup, ElementPlacement.PLACEATEND);
result:
     just 01,03,05 into the mygroup, 02,04 still in K_layer.
     I don't know why ?
1.    I try K_layer.pathItems.length=5 is correct
2.    and also i try
     K_layer.pathItems[0].move(mygroup, ElementPlacement.PLACEATEND);
     K_layer.pathItems[1].move(mygroup, ElementPlacement.PLACEATEND);
     K_layer.pathItems[2].move(mygroup, ElementPlacement.PLACEATEND);
     K_layer.pathItems[3].move(mygroup, ElementPlacement.PLACEATEND);
     K_layer.pathItems[4].move(mygroup, ElementPlacement.PLACEATEND);
     stop in the pathItems[3] and show 「error 1302 no such element」
anybody to help, thx~

Answer 1

result:
     just 01,03,05 into the mygroup, 02,04 still in K_layer.
     I don't know why ?
when you remove k01 to move it into the group, all other rearrange their indexes, so k02 becomes pathItem[0] hence, in the next run, it gets skipped since your moving pathItem[1] (k03 at this point).
do it like this
var myDoc =  app.activeDocument;      
var K_layer = myDoc.layers.add();
var mygroup = K_layer.groupItems.add();
var k01 = mygroup.pathItems.add();  k01.name='01';
var k02 = mygroup.pathItems.add();  k02.name='02';
var k03 = mygroup.pathItems.add();   k03.name='03';
var k04 = mygroup.pathItems.add();  k04.name='04';
var k05 = mygroup.pathItems.add();  k05.name='05';