Highcharts with DHTMLX menu appearance

I use dhtmlx menu on my charts. (legendItemClick event). It was working well when i use highcharts 3.0.1 . Today, I upgraded to 4.1.7 but dhtmlx menu's legendMenu_<?=$id?>.showContextMenu(x,y) function does not work like old one.

When i inspect the menu element on firebug, i see display: "none". I tried to change it manually. However, Id is randomly generated.

legendMenu_<?=$id?> = new dhtmlXMenuObject();
legendMenu_<?=$id?>.renderAsContextMenu();

How can i fix?