WD ABAP and Portal theme

Hi,
I am launching a WD ABAP application from a Portal iView and would like the application to take on the Portal theme. The launching of the application is being implemented like this:
DATA: low_window TYPE REF TO if_wd_window_manager,
              lv_url    TYPE string.
CALL METHOD cl_wd_utilities=>construct_wd_url
    EXPORTING
      application_name = 'zmy_wd_abap'
    IMPORTING
      out_absolute_url = lv_url.
lo_result = low_window->create_external_window(
               url             = lv_url
                title          = 'My WDABAP'
                modal       = abap_true
                has_menubar    = abap_false
                has_location   = abap_false ).
Should I set the application parameters WDFORCEEXTERNALSTYLESHEET and WDTHEMEROOT. Obviously the preference would be to reference the custom CSS in the portal. I do not want to store the stylesheets in the MIME repository if it can be helped.
Any help would be much appreciated.
Cheers,
John

Update. I got the Portal Administrator to zip the theme folder (from the directory on the portal server), unzipped the files into a local directory and uploaded the directory to the MIME repository.
I proceeded to set the WDTHEMEPORTAL to the uploaded directory. Unfortunately, the WDA application is still being rendered with no layouts. On viewing the source, I note that the reference to the CSS is as follows
<link rel="stylesheet" type="text/css" href="/sap/public/bc/ur/customerthemes/myTheme/ls/ls_ie6.nosprite.css?201010290817">
I was expecting the reference to be:
"/irj/portalapps/com.sap.portal.design.urdesigndata/themes/portal/customerthemes/myTheme/ur/ur_ie6.css?7.0.23.2.0"
I also tried the following with the same result"
http://..MYWDA?sap-cssurl='https://MyPortalServer/irj/portalapps/com.sap.portal.design.urdesigndata/themes/portal/customer/myTheme/ur/ur_ie6.css?7.0.23.2.0'
Cheers,
John

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