[Zope] Expand macros in a file system based page template

When editing a page template directly in ZMI, there is an "Expand macros when editing" option allowing me to see the page template source with all macros expanded. This feature is quite handy in tring to understand complex macros. However, if the page template is based on FSDV, this feature is no longer available. How can I under this circumstance see the expanded source code of page templates with macros? Best Regards -- HONG Yuan Homemaster Trading Co., Ltd. No. 601, Bldg. 41, 288 Shuangyang Rd. (N) Shanghai 200433, P.R.C. Tel: +86 21 55056553 Fax: +86 21 55067325 E-mail: hongyuan@homemaster.cn