Change Lib Manager Background

Hello,

I am trying to change the library manager background colour to black ( since dark mode is popular these days ).

I tried changing the .Xdefaults file and re-starting cadence.. it did not work.. 

!Change lib manager background
cdsLibManager*Background: black
cdsLibManager*textColor: white
cdsLibManager*XmDialogShell*Foreground: white

I also tried putting it on .cdsenv and re-started cadence and that did not work either..

;Change lib manager background
;cdsLibManager*Background string "black"
;cdsLibManager*textColor string "white"
;cdsLibManager*XmDialogShell*Foreground string "white"

OR 

;cdsLibManager*Background: black
;cdsLibManager*textColor: white
;cdsLibManager*XmDialogShell*Foreground: white

I removed the comments there and tried it and that also did not seem to work.

Anyone has any ideas. Hopefully this should have been straightforward, but not able to make it work.

Thanks,

V