Turn a string into a movieClipInstanceName that exists within a known movieclip

programming flash
1

I found this code to turn strings into a movieClipInstanceName.


// CREATE THE STRING 
var newString:String = "movieClipInstanceName"; 

//CHANGE THE ALPHA OF THE MOVIECLIP TO 0 
this[newString].alpha = 0;

However, when using this code for a movieclip within a known movieclip…


mc1.this[newString].alpha = 0;

…or…


this["mc1"].this[newString].alpha = 0;

…I get this error…

1084: Syntax error: expecting identifier before this.

This…


this["mc1." + newString].alpha = 0;

…throws this error…

Error #1010: A term is undefined and has no properties.

Is there a workaround that I am missing?

Thanks.