Moving a window to negative value

[Sl4d3]

Hi,

For my ui, i was making a small button to quickly switch from small to big display.

I was testing out and everything is ok if i use positive value. The windows just move as it should. But if i try to use negative value (0,-100) nothing happen, window won't move to where it's supposed to.

this far i was using something like this ->
This works

Parent.Leftpanel.Location=150,100
OnPress=PanBig

This don't

Parent.Leftpanel.Location=-150,-100
OnPress=PanBig

i also tried to "quote" each value, and to use (). Neither seem to work.

Any help is much appreciated, thank you !