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dhtmlx Combobox optionlist positioning

The position of list must be exactly next to the input on opening moment , if you scroll container without closing combo list - it may desync.
There is no straight solution. 
You can 
a) add onscroll handler to scrollable div and call combo._positList(); from it
b) you can change the way how combo list attached
line 475
document.body.insertBefore(this.DOMlist,document.body.firstChild);  
can  be changed to code , which append list element to your scrollable container instead of document.body

I have tried several variations on line 475.  Everything I try breaks the functionality of the drop down all together.  Has anyone successfully altered the combobox to "float" with the input box on a scrollable div?

Please check attached sample. Modified line marked in code with /*update*/ mark