how to draw gtk widget(like buttons) in the firefox npapi plugin under linux?

Hello everybody,

I has known how to write a simple npapi plugin. But now I am in troubles to draw some buttons in the plugin.

I download a simple sample named webp-npapi (http://code.google.com/p/webp-npapi-linux/) and modify it, it now can work well in my firefox.

I also download a complex sample named npapi-vlc (http://git.videolan.org/?p=npapi-vlc.git;a=summary) and has read it.

I want to draw some buttons in my own plugin, so I imitate the codes of npapi-vlc to modify webp-npapi. I change the type of webp-npapi from windowless to window by comment the following codes in constructor of CPlugin class:
(http://code.google.com/p/webp-npapi-linux/source/browse/trunk/CPlugin.cpp)

/*
	// Make sure we can render this plugin
	NPBool browserSupportsWindowless = false;
	s_pBrowserFunctions->getvalue(instance, NPNVSupportsWindowless, &browserSupportsWindowless);
	if( !browserSupportsWindowless )
		throw std::runtime_error("Windowless mode not supported by the browser");
	s_pBrowserFunctions->setvalue(instance, NPPVpluginWindowBool, (void*) false);
*/

then I start draw a button in CPlugin::setWindow() function：

NPError CPlugin::setWindow(const NPWindow * const window)
{
	#ifdef WEBPNPAPI_DEBUG
	printf("CPlugin::setWindow() - Window set\n");
	#endif
	
	m_window = *window;

        //I add these codes to draw a button
	printf("test start\n");
	GdkColor color_bg;
	gdk_color_parse("#AAAAAA", &color_bg);

	Window socket = (Window)m_window.window;
	GtkWidget *parent = gtk_plug_new(socket);
	gtk_widget_modify_bg(parent, GTK_STATE_NORMAL, &color_bg);
	GtkWidget *button = gtk_button_new_with_label("hello");
	gtk_container_add(GTK_CONTAINER(parent), button);
	gtk_widget_show_all(parent);
	printf("test end\n");

	GtkRequisition req;
	req.width = m_window.width;
	req.height = m_window.height;
	gtk_widget_size_request(parent, &req);

	return NPERR_NO_ERROR;
}

But, It doesn't show anything in the webpage...

So I really want to know what is the most important things you must notice when you want to draw some gtk widget in your plugin?

thx!
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