Dynamically adding TextField to MovieClip

programming flash
1

I am trying to add TextField to a MovieClip using AS 3.0 with following code:

mc = new MovieClip();  
                   
mc.graphics.beginFill(0x000000);  
mc.graphics.drawRect( 0, 0, 200, 200 );  
mc.graphics.endFill();  
              
var t:TextField = new TextField();  
t.embedFonts = true;
t.antiAliasType = "advanced";
t.text = "TEST"; 
                  
var tf:TextFormat = new TextFormat();
tf.color = 0xA5C71B;
tf.size = 30;
tf.font = "Arial";
                       
t.setTextFormat(tf);
mc.addChild( t );  
                   
stage.addChild(mc);

But the problem is that MovieClip (black rectangle) is displayed on stage but without the text. Anyone knows what’s the problem?

thanks,
best regards