Problems with mx:Menu position on PopupButton click.

Hello,

I'm using the mx emulation to port an existing application to Royale JS.
I'm using mx.controls.PopUpButton to display a menu on click.
The position at which the mx.controls.Menu appear change based on the menu widths.
The larger is the menu is the offset. It's as if the offset is equal to the menu's width.

As examples, here the button clicked is "PHARMACIE"

And here it is "SOIN"

I haven't been able to identify the problem yet. And can't say if it comes from Menu, or PopUpButton.

Also as it is my first post here, i'll use this opportunity to thank you all for your great job with this project.