It is not possible to apply the triton theme,ubuntu, etc. not through the Theme Manager via Refresh, not in the designer. (Refresh doesn't work for some reason).  I fix it (Crutch(hack) : I put the UniGuiConst.pas module next to the project and changed the Default_EXTHEME to the desired theme and it worked: Version:  1.90.0.1564  PS: ReCallLastTheme:=True; (but is not working in Linux (CentOS,RHEL) and works well in Windows).