1. A method comprising: displaying, by a processing device, a panel superimposed on a graphical user interface (GUI) virtualization system management page; displaying on top of the panel a dialog box comprising an input user interface element; receiving, by an event handler of the panel, an event associated with a user interaction with the panel outside of the dialog box; generating, by the processing device, an alert in response to the user interaction indicating that the user interaction is invalid, wherein the alert is in a visual form; and preventing an event handler of the GUI virtualization system management page from receiving the event.