Creates a new MDI (Multiple Document Interface) object. Class specific
%OPTIONS
are:
-minsize => [X, Y] specifies the minimum size (width and height) in pixels; X and Y must be passed in an array reference -maxsize => [X, Y] specifies the maximum size (width and height) in pixels; X and Y must be passed in an array reference -minwidth => N -minheight => N -maxwidht => N -maxheight => N specify the minimum and maximum size width and height, in pixels -topmost => 0/1 (default 0) the window "stays on top" even when deactivated