DynamicStreamItem and Playlist

Hello!

Following the code shown in this example (Examle 6): http://www.adobe.com/devnet/flashmediaserver/articles/dynstream_advanced_pt2_04.html I made this:

var ds:DynamicStream = new DynamicStream( myNetConnection );
 
//The first item in the playlist
var dsi:DynamicStreamItem = new DynamicStreamItem();
dsi_1.addStream( "mp4:sample1_500kbps.f4v", 500 );
dsi_1.addStream( "mp4:sample1_700kbps.f4v", 700 );
dsi_1.addStream( "mp4:sample1_1000kbps.f4v", 1000 );
 
dsi_1.length = 30;
 
//The second item in the playlist
var dsi_2:DynamicStreamItem = new DynamicStreamItem();
dsi_2.addStream( "mp4:sample2_500kbps.f4v", 500 );
dsi_2.addStream( "mp4:sample2 _700kbps.f4v", 700 );
dsi_2.addStream( "mp4:sample2 _1000kbps.f4v", 1000 );
 
dsi_2.reset = false;
dsi_2.length = 20;
 
ds.startPlay( dsi_1 );
ds.startPlay( dsi_2 );

But this code its not working as should.

When dsi_1 finish playing in 30 seconds, dsi_2 never start. Instead of the second item, the first (dsi_1) start playing again.

What I'm missing in my code?

Thanx,

Alex Lopez.