DesktopHTMLViewer.NewWindow
From Xojo Documentation
Event
HTMLViewer.NewWindow() As DesktopHTMLViewer
New in 2021r3
Supported for all project types and targets.
New in 2021r3
Supported for all project types and targets.
Called when a new browser window is requested.
Notes
Returns a new instance of an HTMLViewer to load the page in that viewer or Return Nil when you do not want to allow the window to open.