GtkFileChooserButton on grabbed windows

[Francesco Montorsi <f18m_cpp217828 yahoo it>]

Hi,
  I'm using GtkFileChooserButton and I've found that if I call 
gtk_grab_add on the toplevel window containing that button, then the 
dialog shown by the button will be un-responsive while the main window 
will continue to handle user events (i.e. the dialog created by the 
dialog is not modal).

This can be seen also in gtk-demo\pickers.c adding:

gtk_grab_add(window);

before the call to gtk_widget_show_all(). Running the pickers sample and 
clicking the dir-selector or the file-selector will show two unusable 
dialogs... how can I avoid it (for some long-to-explain reasons, I 
cannot remove the gtk_grab_add call on the parent window) ?

Thanks a lot !
Francesco
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