Abort a PAGE
 

I use a UMUI_PAGE_ADDITIONALTASKS in my installer.
I need to Skip (abort) this page, checking some previuous USER Selection.

It seems I cannot use a PRE function; i've tried:

to use !define MUI_PAGE_CUSTOMFUNCTION_PRE PreFunc (just below the page insert: no effect on my PAGE
to insert the USER Selection control (and Abort), into the [addtasks_function]: this works just ONE time, when i RUN the installer; NO effects when the user return to the page using BACK button.

Please, give me help