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dhtmlxmenu - TypeError: polygon is undefined

why do i keep getting this error when adding items to context menu:
TypeError: polygon is undefined

code always crashes with the above error when calling the addNewSibling or addNewChild methods!
am i missing js files or doing something wrong?


code snippet:

this.grid.enableContextMenu(this.menu);
    this.menu.renderAsContextMenu();
    this.menu.setOpenMode("web");
    this.menu.setImagePath(this.ROOT_RESOURCE_PATH+"dhtmlx/dhtmlxMenu/sources/imgs/dhxmenu_dhx_blue/");
    this.menu.setIconsPath(this.IMAGE_RESOURCE_PATH);
    this.menu.addContextZone(this.grid.entBox.id)

    //this.menu.addNewSibling(null,"add","Add Succursale",false,"","");
    /*this.menu.addNewSibling(null, "new", i18n["new"], false); // adding the first item to the menu, "nextToId"

Hello,
the first element must be added as a child:

this.menu.addNewChild(this.menu.topId,0,"add","Add Succursale",false);