As you probably know, it is possible to control the size of Web popup windows in code (btw, would not it be nice to control this via the application model as well?) or end-users can perform resizing themselves. Starting with 12.2, end-users will also be able to quickly maximize the popup window using the familiar interface. Let's see the attached video for more details:
In this particular case, all kudos go to our ASP.NET team, because they have improved the ASPxPopupControl component in 12.2 and my work was to just enable a single option by default and ensure that it operates correctly in XAF Web UI. I hope you are looking forward to the 12.2 release!