Bug 178519 Problems in multi-rows header
Please see the attachments.
engine/org.eclipse.birt.report.engine/src/org/eclipse/birt/report/engine/layout/pdf/PDFTableLM.java
return true;
	}
	protected void repeat( )
	{
		addCaption( tableContent.getCaption( ) );
		repeatHeader( );
	}
	public void startGroup( IGroupContent groupContent )
	{
		int groupLevel = groupContent.getGroupLevel( );
		groupStack.push( new Integer( groupLevel ) );
	}
	public void endGroup( IGroupContent groupContent )
	{
		
		int groupLevel = groupContent.getGroupLevel( );
		updateUnresolvedCell( groupLevel, false );
		updateUnresolvedCell( groupLevel, true );
		assert ( !groupStack.isEmpty( ) );
		groupStack.pop( );
	}
	private int getGroupLevel( )
	{
		if ( !groupStack.isEmpty( ) )
		{
			return ( (Integer) groupStack.peek( ) ).intValue( );
		}
		return -1;
	}
	private int createDropID( int groupIndex, String dropType )