Actionscript 3 :: Convert A XML Node To A MovieClip?

I have an xml document that I would like to use to show MovieClips in my .fla:

<linkedMovieClip>TestClip</linkedMovieClip>

In my .fla, I created a symbol called TestClip and select Linkage > Export for Actionscript and named it TestClip.

My code in my Document class traces the xml:

var t:*= getDefinitionByName(String(slideItem.linkedMovieClip)) as Class;
var linked:MovieClip = new t();
trace("linked is..."+ linked); // outputs [Object TestClip];

[Code]....

However, I am still getting an error message. When I check the debugger it's from this line:

var t:*= getDefinitionByName(String(slideItem.linkedMovieClip)) as Class;