Mnu:Init(Name,R,C,CurSize,Items,SelItems,Clr,Shadow): public: return true
  This method serves for initialising and positioning of the window for
  the menu to the screen to be nearest as possible to the cursor and
  not to cover the desired text (started on the R,C position with the length
  of CurSize). The window must be whole visible. After the preparing task is
  done, the menu is painted to the screen and the control is returned to the
  calling function.

  Parameter description:
  ~~~~~~~~~~~~~~~~~~~~~~
  Name: text or code block: no default
   Text or code block as window title.

  R: numeric: default is Row().
   Text -row- (cursor) screen position, which shouldn't be covered,
   but the window should be as near as possible to this text.

  C: numeric: default is Col().
   Text -column- (cursor) screen position, which shouldn't be covered,
   but the window should be as near as possible to this text.

  CurSize: numeric: default is 1.
   Text width which shouldn't be covered, but the window should be as near
   as possible to this text.

  Items: array: no default the data must be entered
   Text strings array, representing the menu.

  SelItems: array: default is the array filled with the true items of
   the same size as the array selected by Items parameter.
   This array enables the menu items selection.

  Clr: character: default is m->Color:Edit.
   Window colors.

  Shadow: logical: default is true for color monitor, false for monochrom.
   If true the shadow is painted around the window.