View:AddMemo(cLongName,cShortName,cField,bWhen,bValid,nRowSize,nColSize):
  public: return true
  The object is appended with next column defined as memo field.
  The virtuality is tested, it is not allowed to edit the fields
  with RecNo()>LastRec().

  Parameter description:
  ~~~~~~~~~~~~~~~~~~~~~~
  LongName: character: default is ShortName
   Column name used in mode of  Form(ular).

  ShortName: character: default is ""
   Column name used in mode of Browse.

  cField: character: no default
   Full memo field name (field->name),
   if no prefix used, it is taken from instvar variable View:Alias.

  When: code_block: default is {||true}
   Code block to be evaluated before the entering the column editation.
   If false the editation is disabled. The result fields or read-only fields
   can be produced this way.

  Valid: code_block: default is {||true}
   Code block to validate the entered data, if the result is true the data
   is valid, if false the entered data must be reedited.

  nRowSize: numeric: default is MaxRow()/3
   The MemoEdit window height as row number.

  nColSize: numeric: default is MaxCol()/2
   The MemoEdit window width as column number.