I will not answer directly your question but i will suggest to you an idea that you can try.
Some times for generate pop-ups with high level of personalization and better look and feel for the user, I create the pop-up window with objects in QlikView, I create a text box as background and over this I add some objects like text, images, buttons, etc.
Then, to all this objects you can set the move/copy/resize options to disabled and you set the show conditional based on variable value (for example 1 or 0, on or off). Then you must define when this pop-up must appear and based in it is where you need create the trigger. For example on a field trigger, or when the user clear filters, or other posibilites.
Remember that you can use macros too for win more posibilities.
Tell me if you have any question.
As an example of Guzman's proposal: http://community.qlik.com/blogs/qlikviewdesignblog/2014/02/28/enhancing-the-user-experience-using-conditional-expressions
(last part when he explains some Help context popup)