Sub windows with widgets

Hi Malcolm,
I would love to see an option where clicking on an icon( can be button , text etc…)would open a sub window( instead of navigating to a new page)where would able to put more sliders or buttons), a popup window would be sexy…
In real use , lets say , i have a button for a specific monitor output and if i click on that icon, a popup subpage opens , where i can put specific controls for brightness, contrast etc…
Right now, the only way to achieve this is to link it to a completely new and separate page.