Function: gch

CALL:

h = gch(tag, hwin, h)

DESCRIPTION:

Find uicontrol handles with specified tags

INPUT:

tag any 
String or cellstring with tags
hwin any 
(optional) handle of window to search in, default value: gcf
h any 
(optional) the default value. Return this value unless it represents
 "unitialized" (0). In this case return h = gch(tag, hwin)

OUTPUT:

h any 
array with handles of uicontrol object with the specified tag

EXAMPLE: 

     h=0; %0 means unitialized
     HWIN = figure;
     if expression
         %this line might or might not be reached
         h=gch('mytag',HWIN);
     end
     h=gch('mytag',HWIN,h); %retrieve h if uninitialized