[RESOLVED] Array string is textField or movieClip?

[somlemeg]

Converting AS2 to AS3 ,
In my project I have an array that refers to a set of movieClips and textFields.
I want to cycle trough the array and find out wether the string represents an movieClip or array.

var changeFocusItems:Array = new Array();
changeFocusItems.push("myMovieClip");
changeFocusItems.push("myTextFieldOnStage");

for each (var myItem:String in changeFocusItems) {
    if (myItem is TextField) {
        // do change textField property..
    } else if (myItem is MovieClip) {
        // change movieClip property
    }
} 

How do I recognise myItem string as a textField / movieClip?