[ic] Setting title of results page

[DB]

I have a page with the following search:

[query
    type=list
    more=1
    ml=150
    sql=|
        SELECT  distinct name
        FROM    cat
        |]
[list]
<h3>[sql-param name] items -
Click for a list of <a href="[area search=|
    se=[sql-param name]
    sf=category
    st=db
    co=yes
    op=eq
    sp=brands_results
    va=category_name=[sql-param name]
|]"> [sql-param name] items </a></h3>
[/list]
[/query]


Now in the body of the results page, the tag
[value category_name]
gets displayed as expected. However I also want that value to be used
for the results page's title. In the results page's template I have:

[comment]
ui_template: leftonly_2
ui_type: template
ui_name: leftonly_2
ui_version: 5.4.1
ui_label: Page with top/left areas 2.
ui_source: templates/leftonly_2
ui_template_layout: LEFTONLY_TOP_2, UI_CONTENT, LEFTONLY_BOTTOM

page_title:
        label: Page Title
        width: 50

members_only:
        code: members_only
        label: Members only?
        options: 1=Yes,=No*
        type: yesno

meta_keywords:
        code: meta_keywords
        db: ^@
        label: Meta keywords
        type: text
        width: 50

meta_description:
        code: meta_description
        db: ^@
        label: Meta description
        type: text
        width: 50

[/comment]
[set page_title][/set]
[set members_only][/set]
[set meta_keywords][/set]
[set meta_description][/set]
<!-- BEGIN PAGE_PICTURE -->

but if I put
[value category_name]
into the title slot in the admin content editor, the title of the page
is literally "[value category_name]" and is not getting interpreted as I
want.

Does anyone have an idea why the tag gets displyed correctly in the page
body but not in the title?

DB