Expected a field name after '.' operator

Dear All,

I have 5 buttons in one movieclip “star_mc”

  • star_mc.sub1
  • star_mc.sub2
  • star_mc.sub3
  • star_mc.sub4
  • star_mc.sub5

I give it this script below on frame 1 (Scene 1)

for(i=1;i<=5;i++)
{
strButton = “sub”+String(i);

star_mc.this[strButton]._xscale = 200; // ERROR !!! 

}

How can i fix this error “Expected a field name after ‘.’ operator” ?

Thanks You,
Zee