Improve layout of login window when adding web content

[LindsayRaabe_FPCWA]

When adding a web service, I get the login window appear asking for my username and password to access the service. What is annoying and needs improvement is the Adding data progress/loading window appearing over the top of the login window and sitting there until the credentials have been added. 

It would make more sense if the Adding data window appeared behind the login window (I have to drag it out of the way to see what I have typed).