How can I change the background color of the default tab on kivy? I'm able to change the background of the content and other tabs, but the default tab remains unchanged, this is my code:
class DAP(App):
    title = u'Aplicativo do DAP'
    # Funções para evitar que o aplicativo desligue ao mudar o foco da tela no celular
    def on_pause(self):  return True
    def on_resume(self): pass
    def build(self):
        self.cor_fonte = (0, 0, 1, 1)
        self.cor_fundo = (1, 1, 1, 0)
         #Abas
        self.painel                  = TabbedPanel(background_color = self.cor_fundo, default_tab_text=u'Principal')
        self.aba_resumo              = TabbedPanelHeader(text=u'Resumo PC',    background_color = self.cor_fundo, color = self.cor_fonte)
        self.aba_registros           = TabbedPanelHeader(text=u'Registros PC', background_color = self.cor_fundo, color = self.cor_fonte)
        self.painel.add_widget(self.aba_resumo)
        self.painel.add_widget(self.aba_registros) 
        self.icon  = u'logo_dap.png'
        # Definições iniciais
        tamx = Window.system_size[0] ; tamy = Window.system_size[1]         
        return self.painel
if __name__ in ('__main__','__android__'):
    DAP().run()
any idea?
 
    