Don't understand your requirement exactly, but any sheet object can be hidden using the Show conditonal option on the Layout properties. I use buttons to change variables to 0 or 1 which I then test in the show conditional.
Word of warning is that if you go the macro route of openning up new browser windows, you may find it isn't supported by QlikView when clients are connecting directly with browsers (i.e. the Ajax zero-footprint client).
That won't work with an info load afaik. What you could do is use text boxes and charts that show/hide by clicking on other text boxes. In this demo document you can find a very nice example on the Campaign Details tab. Click on the Filter by Date 'button' (it's a text box) or the 'I' info button next to it. That's the kind of pop-ups you can create in Qlikview. It's all done by showing and hiding objects as needed.
Thank you Gysbert,
I implemented a text box that minimize or restore the plot, but my client wants something similar to what a tool they have in flash shows, that is when you put the mouse over a region you get a pop-up with a chart. Do you know if there is possibility of doing that with Workbench?