It might happen if you have explicit height and width on the components.
You are exactly right saisri. But if i want to change the width and height to percentage i need to revamp the whole project. Is there any other way to solve it.
I would try my hands on the applications scaleX and scaleY, I guess you already know the applciations standard height and width, if the app's height and width is more than the standard height/width calculate the scaling factor from the formula NewHeight/standardHeight = scaling factor(all this calculations has to be done in the JS), do this for width also.
Next use java script external interfaces to call a method in flex passing down the scaleX and scaleY values to it which does this.scaleX = new value and same for scaleY.
2nd option: group has resizeMode='scale' property, if the browser size increases(i.e. app height increases/decreses) then the content in the app scales. I would wrap the whole application in this tag and tweak.