ImageBrowser - a method to change supported file types

I would only like a sub-set of the file types the ImageBrowser supports and it would be nice if a method could be provided for this.

I can do it (see below) but as I just found out the internal way ImageBrowser is dealing with the file types has changed without me realizing it, which obviously introduced a bug in my application.

I am currently I do this:
        dlg = ib.ImageDialog(self, initial_dir)

        # Change list of files to be supported
        dlg.fl_ext_types = (
            ("All supported formats", "All"),
            ("BMP (*.bmp)", "*.bmp"),
            ("GIF (*.gif)", "*.gif"),
            ("PNG (*.png)", "*.png"),
            ("JPEG (*.jpeg)", "*.jpeg"),
            ("JPG (*.jpg)", "*.jpg"),
            )
        dlg.set_type,self.fl_ext = dlg.fl_ext_types[0] # initial file filter setting
        dlg.fl_types = [ x[0] for x in dlg.fl_ext_types ]
        dlg.sel_type.Clear()
        dlg.sel_type.AppendItems(dlg.fl_types)
        dlg.sel_type.SetSelection(0)
        dlg.fl_ext_types = dict(dlg.fl_ext_types)

        dlg.Centre()

But it would be nice if a method along these lines could be added to ImageBrowser:
def ChangeFileTypes(self, ft_tuple)
        # Change list of file types to be supported
        self.fl_ext_types = ft_tuple
        self.set_type, self.fl_ext = self.fl_ext_types[0] # initial file filter setting
        self.fl_types = [ x[0] for x in self.fl_ext_types ]
        self.sel_type.Clear()
        self.sel_type.AppendItems(self.fl_types)
        self.sel_type.SetSelection(0)
        self.fl_ext_types = dict(self.fl_ext_types)

Werner