lm_shiftrank

Change the rank of a frame. The function uses uses userdata
stored in object from which function was called.

CALL:

   hchange = lm_shiftrank(option, resize)
 

INPUT:

   option:
     string with shift direction, possible values:
     - 'up' increase rank of frame
     - 'down' decrease rank of frame
   resize:
     boolean, if true call lm_resize afterwards
 

OUTPUT:

   hchange: 
     array of modelit.layout.Frame whose position have changed.
 
  NOTES:
   If the 'splithor' property of the parent frame is set to true
   this causes the frame to move to the left or right or
   up or down if this property is set to false
 

APPROACH:

   The handle of the frame for which the rank must be changed must be
   stored in the userdata field of the uicontrol whose callback is
   executed.