BROWSE2D()

  Short:
  ------
  BROWSE2D() Popup  tbrowse of 2 dimension array (array of arrays)

  Returns:
  --------
  <nSelection> => selected item, 0 if none

  Syntax:
  -------
  BROWSE2D(nTop,nLeft,nBottom,nRight,aArr,[aHead],[cColor],;
        [cTitle],[bExcept])

  Description:
  ------------
  Pops up a box at <nTop,nLeft,nBottom,nRight> and
  tbrowses array contained in <aArr>.

  <aArr> must be a 2 dimensioned array, like the ones
  returned from DIRECTORY() or DBSTRUCT().

  i.e. { array(n),array(n),array(n) } where <n> is the
  same length for each subarray.

  [aHead] an array of column headers matching the
  number of elements in a single subarray of <aArr>. Default is
  none.

  [cColor] popup box color. Default is sls_popcol()

  [cTitle] title string for the box. Default is none.

  [bExcept] is a codeblock that will be evaluated for
  any exception keys - any keys other than up/ down/ right/ left/
  pgup/ pgdn/ home/ end/ enter/ esc. [bExcept] will be passed the
  parameters: key value, tbrowse object, element

  Examples:
  ---------

   proc test

   local a := directory()
   browse2d(5,5,20,40,a, ;
           {"File","Size","Date","Time","Attribute"},,"Choose a File")

   use customer
   a := dbstruct()
   browse2d(5,5,20,40,a,nil,nil,nil,;
    {|k|msg(str(k)+" is not a valid key")})
   // note the exception block

  Source:
  -------
  S_2DBRZ.PRG