behaviour of iterator and remove

Hi
 
I am trying to remove all the widgets from a HorizontalPanel. Why the first code segment always have one widget left?
Why I have to remove widgets by iterator like code segment 2?
 
1>
Iterator<Widget> it=this.iterator();
while(it.hasNext())
{
Widget widget=it.next();
this.remove(widget);
}
  
2>
Iterator<Widget> it=this.iterator();
while(it.hasNext())
{
it.next();
it.remove();
}
 
 
 
 Thanks

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