gtkD window centering message up and no app on taskbar

[Johnson Jones via Digitalmars-d-learn]

When trying to center the window. If one uses ALWAYS_CENTERED any 
resizing of the window is totally busted. CENTER also does not 
work. move(0,0) seems to not be relative to the main display. I'd 
basically like to center the window on the main display or at 
least be able to set coordinates properly. Windows sets (0,0) to 
be the lower left corner of the main display I believe. What 
happens is that the gtk window, when using 0,0 actually is like 
-1000,0 or something in windows coordinates and ends up on my 
secondary monitor.

When the app starts there's no taskbar icon. Luckily I still have 
the console shown but Eventually I'll need the taskbar. I'm not 
setting skipTaskBarHint, but I have tried both true and false 
without any difference.