This is a characteristic of SiriL which could be improved:
Suppose that you work on the Histogram window of a frame;
Suppose that you want now to study the histogram of another frame and you type Control-O to open the Open File dialog.
With SiriL, this dialog stays in the background while it should become the frontmost window.
(this is at least what the Mac users are waiting for)
Would it be possible to bring the Open File dialog directly to the front ?