Scalled ? Movie Clip

Hi!

I w got one .as file with main class that inherits from MovieClip
when I add another MovieClip object into this main class (or even Bitmap, textfield) everything looks scaled (but when i take .width it seems ok ?)
And what more - when i place new movieclip with addchild and it’s property .x = 0 it is about 10 - 15 from left of all movie ?

I use “handwritten” code and flex 4.01 mxmlc.exe to compile it.
Any suggestion?

Well after 5 days I found it… near…
I added [SWF(width=“504”, height=“335”, frameRate=“18”)] before main class and it works - but what if I want to width and height to be variables?