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I performed several google searches on the internet to find a solution for tool-bar item. I tried this code without resulting. Nothing happens. I also tried with Emacs default interface (the same of the newly installed program). The results were the same when I used my settings.

Below is the code that does not work even with the Emacs default settings.

(add-hook 'after-init-hook
          (lambda ()
            (define-key global-map [tool-bar hilite-button]
              '(menu-item "hilite" my-hilite-fun
                          :image (image :type xpm 
                                        :file "/home/alexandre/emacs-lisp-macros/shell.xpm")))))
(tool-bar-add-item "hilite" 'my-hilite-fun
                   'my-hilite-fun
                   :help "my hilite function")

Then I discarded this text and used the model below. This .emacs code section works well. The icon appears on the toolbar and works properly.

(define-key-after global-map [tool-bar hilite-button]
  '(menu-item "eval" akx-highlight-emacs-lisp
              :image (image :type xpm :file "/home/alexandre/emacs-lisp-macros/shell.xpm")
              :enable 1
              :help "akx-highlight-emacs-lisp"))

However, the icon disappears during the edition of the document, or even after a buffer change.

To get it back it's necessary M-x eval-buffer .emacs, and this unwanted behavior occurs as before.

When closing the session and restarting it, the icon no longer appears in the toolbar. And I need to reload the .emacs buffer.

I have several questions here and in no one have found a solution. How to make the icons not disappear and stay saved for future sessions?

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