When you choose the option "Wallpaper" (or "both") as "background", you may enter the "Wallpaper" button, and you will see the following window:
Here you may specify a wallpaper to be shown in every window of your program. It can be fixed (select "Template" in the "Specified in" option) or user defined ("User Variable" choice). In the "Template" case, if you specify the graphic names in the Wallpaper entries, the graphics will be included in the project.
If you choose "User variable", you must specify the name of the variables that will hold the wallpaper name. It has to be a STRING() type variable, and long enough to hold the whole graphic name, including path. The variable name drop-list will shown only the global variables that contains "back" or "fondo" as part of the name, case insensitive (for example, "GLO:Fondo").
The wallpaper will be shown with the option selected in "Mode", which may be "stretched" to be fit to the windows size, "Tiled" to be repeated in real size filling the window, or "Centered" to be centered in real size in the window. If the mode is variable (for example, GLO:FondoModo (translated, Background Mode) as shown above) it has to be STRING(1). Valid values for the content of this variable are "S" (stretched), "T" (tiled) and "C" (Centered).
(Under construction)