BGCOLOR
Element’s background color.
Value
The RGB or RGBA components, in the format "R G B A".
Values should be between 0 and 255, separated by a blank space. For example, "255 0 128", red=255 blue=0 green=128.
Alpha is optional and assumed to be 255 if not specified. It is used only by the controls drawn with IupDraw, such as IupGauge, IupDial and the IupFlat* controls, with the driver limits listed there.
Default: It is the value of the DLGBGCOLOR or TXTBGCOLOR global attributes. TXTBGCOLOR is used on IupText, IupList, and IupTree (Usually is "255 255 255" - white.). 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".
Affects
All controls that have visual representation, but with some restrictions.
Several controls have transparent parts that are not affected by the BGCOLOR.