Revit :: Visibility Of Lines Placed In Front Of Filled Region?

I have created a 'Title Block' family which I am wanting to use as a 'drawing stamp', being used to mark an existing drawing sheet carried forward to another phase of the project as being from the previous phase.  To do this I have created a filled region with an opaque white background and a grey border (gray) to form the extent of the 'stamp'.  I have then created a number of labels for the relevant information and added some lines as borders to the labels.

The problem comes when it is used on a project sheet since the label border lines do not appear.  Since the commands to 'send to the back' or 'bring to the front' are absent when editing a title block I wonder why this is?  Logic suggests that the only workaround is to create a number of filled regions, in jigsaw style, one for each label and to use their borders as the label borders.  However, this seems an enormously long winded an probably kilobyte hungry way of achieving something that should possibly be very simple.  I have to say that it may also have an easy solution that I may have used before but forgotten.