I apologize you didn't get a quick answer to this question! :-)
Catalyst currently does not support scale 9.
In general, Catalyst 1.0 does not have strong support for designing resizable layouts. For example, the ability to constrain edges of objects to different locations is not exposed. I expect we will add this in the future.
For now you will need to take your fxp files over to Flash Builder to add this functionality
thx a lot for ur answer.