Show a colormap dialog

        Parameters
        ----------
        %(show_colormaps.parameters.no_use_qt)s

def show_colormap(cls, names=[], N=10, show=True, *args, **kwargs):
        """Show a colormap dialog

        Parameters
        ----------
        %(show_colormaps.parameters.no_use_qt)s"""
        names = safe_list(names)
        obj = cls(names, N, *args, **kwargs)
        vbox = obj.layout()
        buttons = QDialogButtonBox(QDialogButtonBox.Close, parent=obj)
        buttons.rejected.connect(obj.close)
        vbox.addWidget(buttons)
        if show:
            obj.show()
        return obj