Bug 314088 The table row height does not work correctly in PDF
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/nLayout/area/impl/ContainerArea.java
{
			return children.get( index );
		}
		return null;
	}
	public void addChild( int index, IArea area )
	{
		children.add( index, area );
	}
	public int indexOf( IArea area )
	{
		return children.indexOf( area );
	}
	public void removeAll( )
	{
		children.clear( );
	}
	public void removeChild( IArea area )
	{
		children.remove( area );
	}
	public void accept( IAreaVisitor visitor )
	{
		visitor.visitContainer( this );
	}
	public int getChildrenCount( )
	{
		return children.size( );
	}
	public boolean needClip( )