As other people have already said, you have to use this.refresh to update the controls of the pageframe. Alternatively you could insert the following piece of code in the refresh method of your base class pageframe.

private lcObject

for each lcObject in this.pages
lcObject.refresh
endfor

Each time the page frame is refreshed, it will automatically refresh all pages in it, and their related controls, without the need to 'manually' do it each time you select an active page.

Also, you may find use SET KEY a better solution to SET FILTER. Using SET FILTER is an awful lot slower than SET KEY, especially on large tables. This could be vital if performance is an issue for you.

Derek