Element’s background color.
The RGB components.
Values should be between 0 and 255, separated by a blank space. For example "255 0 128", red=255 blue=0 green=128.
Default: It is the value of the DLGBGCOLOR global attribute. On some controls if not defined will inherit the background of the native parent.
Hexadecimal notation in the format "#RRGGBB" is also accepted in all color attributes. For example, "255 0 128" can also be written as "#FF0080".
All, but with restrictions.