dlgitem_set_background_at
dlgitem_set_background_at(window, listtag, row, background)
Sets the background color for the outline list tag identified by listtag in window. If listtag does not refer to an outline list tag, $ERROR is set and 0 is returned. Otherwise, 1 is returned.
window
the dialog window identifier
listtag
an outline list tag (case sensitive)
row
an offset into listtag(starting from one)
background
a named color or an RGB specification preceded with #
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