How to give (startx, starty) postion of paper-dropdown-menu's popup window

[vivekkumar27june88]

paper-dropdown-menu working fine inside a simple demo page.

But when using inside a page which is created dynamically, then the paper-dropdown-menu's popup position goes random.

Working case: dropdown popup is properly left aligned

Non working code: dropdown popup is coming at some random position.

I've tried setting horizontal-align="right" but still the problem exist.

Please note that I'm creating a parent elements of paper-dropdown-menu inside of dom-repeat and other changes, which I think is causing the problem.

Is there any way by which I can provide the x,y position for paper-dropdown-menu's popup dialog.?