Bug 203191 [Automation][Regression]Contents are shown repeatedly in office word file
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/html/buffer/ContainerBufferNode.java
children.clear( );
	}
	public void start( )
	{
		if(isStarted)
		{
			return;
		}
		if ( parent != null && !parent.isStarted( ) )
		{
			parent.start( );
		}
		if( isVisible )
		{
			ContentEmitterUtil.startContent( content, emitter );
		}
		generator.start( content, isFirst );
		isStarted = true;
		flushUnStartedChildren( );
	}
	public void addChild( INode node )
	{
		children.add( node );
	}
	public void removeChildren( )
	{
		children.clear( );
	}
}