Why is the Find and Replace window is not always on top?

It driving me nuts to always switch back to the Find and Replace window every time I need to copy or do some modification in my segments, coz the window I keep on working with went behind the main window of the program.  I would hardly expect such behavior in MS WORD

How and/or why Trados Developers would decided to go that strange way?  Was it made intentionally for any useful reason? Is there a way to tick off that behavior?