Hi,
 
    I commit new things.
 
    * A new InitMenu event for Window.
    This event is fire when user first select a menuitem.
    It's usefull for refresh menuitem (enable/disable menuitem).
 
    * Add some helpfull methods for textfield too.
 
    * A Notepad sample.
    It's actually not exactly same as standard windows notepad but main feature exists.
 
Changelog
 
    - GUI.pm, GUI_Constants.cpp :
        + Add MessageBox return value constants.
    - GUI.xs :
        + Create : Force a window name for all control.
        + Add MessageBeep.
        + ChooseFont : Change -size by -pointsize option and return value.
    - GUI_Events.cpp :
        + DoEvent_Menu : Add Self for NEM event.
    - GUI_Helpers.cpp :
        + Perlud_Free : Check if svSelf is a valid SV before use it.
    - GUI_MessageLoops.cpp :
        + WindowMsgLoop : Add WM_INITMENU event.
    - Textfield.xs :
        + Fix EN_UPDATE event handler name.
        + New Methods : CanPaste & HaveSel.
    - Window.xs:
        + New InitMenu event.
    - Samples\Notepad.pl : New file
 
 
Laurent