-Constructs a cursor from a wxImage. The cursor is monochrome, colors with the RGB elements all greater
-than 127 will be foreground, colors less than this background. The mask (if any) will be used as transparent.
+Constructs a cursor from a wxImage. If cursor are monochrome on the current
+platform, colors with the RGB elements all greater than 127 will be foreground,
+colors less than this background. The mask (if any) will be used to specify the
+transparent area.
+
+In wxMSW the foreground will be white and the background black. If the cursor
+is larger than 32x32 it is resized.
+
+In wxGTK, colour cursors and alpha channel are supported (starting from GTK+
+2.2). Otherwise the two most frequent colors will be used for foreground and
+background. In any case, the cursor will be displayed at the size of the image.