The Second Window in the external Monitor…

I decided this afternoon to use my external monitor in my development MacBook (instead of connected in the PC as TV displayer).

I open a second window for the current project (as you would guess), but I had troubles.
I forgot how nice it is to have the window with the data for the DB, then in the other window writing the CREATE TABLE code… (for example)

When I run the project with the included monitor’s window frontmost.

Then, the debugger enter in action, but I do not see it ! What a surprise ! The debugger appears on the external monitor !!!

It is certainly not Xojo’s fault IMHO.

Now, some hardware information:

MacBook Pro 13" Retina, 3360 x 2100 @ 144dpi.
Philips External Monitor: 1920 x 1080 @ 72 dpi.

Ideas ?