Bug 211991 Page header items when in a grid within a grid disappear on runtime render
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/HTMLPageLM.java
{
		protected ArrayList nodes = new ArrayList();
		protected BufferNode current;
		protected IContentEmitter emitter;
		
		public ContentDOMEmitter( IContent root, IContentEmitter emitter )
		{
			this.emitter = emitter;
			current = new BufferNode(root, null);
			nodes.add( current );
		}
		
		public String getOutputFormat( )
		{
			return emitter.getOutputFormat( );
		}
		
		public void refreshChildren()
		{
			for(int i=0; i<nodes.size( ); i++)
			{
				BufferNode node = (BufferNode)nodes.get( i );
				node.content.getChildren( ).clear( );
				node.content.getChildren( ).addAll( node.children );
				
			}
		}