Spark DropDownList doesn't display the popup correctly when right to left layout direction and no scroller on the popup

Steps to reproduce:
1. Create a dropDownList skin whith popUpWidthMatchesAnchorWidth of the PopUpAnchor set to false, and popupP{osition to below
2. ItemRenderer of the datagroup is a RichText (but same bugs happens whit the Default Renderer).
3. Set the layoutDirection and direction to "rtl" (rightToLeft)
4. Provide a few data (exemple : 3)

Actual Results:
The popuup is displays from left to right

Expected Results:
It should be display from right to left

Remarks : When the dataProvider contains enought data that the popup has a scroll bar, the popup is correctly displyed from right to left !!!!!

Workaround (if any):