AS2 Dynamic MovieClip Selection

If I have moviecl开发者_C百科ips called "test1", "test2" and "test3" in the _root, I can use:

for(i = 1; i <= 3; i++){
   _root['test'+i]._x = 100;
}

How do i use the "_root['mc']" selection method if all my test mc's are in another mc called layout.

I have tried this but got a syntax error.

for(i = 1; i <= 3; i++){
   layout.['test'+i]._x = 100;
}    

I think you are getting the syntax error because you have layout.['test'+i] instead of layout['test'+i]