A roller blind apparatus comprising a control apparatus; an idle end; and a roller tube located between the control apparatus and the idle end, wherein the control apparatus is coupled to a first corner bracket; the idle end includes one of an idle end spindle and an aperture and a second corner bracket includes the other the idle end spindle and an aperture, wherein the idle end spindle is rotatably mounted within the aperture such that the idle end is rotatably coupled to the second corner bracket; a first frame forming element is located between the first and second brackets; and wherein the frame forming element covers the roller tube.