Limit number of lines in a text editor

Hello.
In my program, i'm creating a text zone and i need to limit the data users will put in this zone.
To create that, i'm using the object cl_gui_textedit. I've looked in the methods of this object but i wasn't able to find one that will limit the number of lines of the text editor.
Did i miss it ? Does anybody knows how i can for example limit the input zone to 5 lines ?
Thanks for your help.
Here's my code
IF g_editor IS INITIAL.
*   Instanciation du container pour la zone de texte
    CREATE OBJECT g_textedit_custom_container
        EXPORTING
            container_name = 'TEXTEDITOR'
        EXCEPTIONS
            cntl_error = 1
            cntl_system_error = 2
            create_error = 3
            lifetime_error = 4
            lifetime_dynpro_dynpro_link = 5.
    IF sy-subrc NE 0.
*      add your handling
    ENDIF.
*   Création de la zone d'édition du texte
    CREATE OBJECT g_editor
      EXPORTING
        parent        = g_textedit_custom_container
        wordwrap_mode = cl_gui_textedit=>wordwrap_at_fixed_position
        wordwrap_position          = 68
        wordwrap_to_linebreak_mode = cl_gui_textedit=>true.
ENDIF.

I just notice there is a method SET_HEIGHT but this one is implemented in CL_GUI_CONTROL.
I tried this :
CALL METHOD g_editor->set_height
EXPORTING height = w_height.
But in fact, i never enter the method.
Do i have to create a CL_GUI_CONTROL object ? If yes, how do i link it to the CL_GUI_TEXTEDIT.
Sorry if some questions mays seem obvious. It's my first object abap program.

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