$buffer->insert ($buffer->get_end_iter, "test\n");

using namespace Gtk;

class MainClass : public Window{
public:
  	MainClass();
  	virtual ~MainClass();

protected:
	Glib::RefPtr<Gtk::TextBuffer::Tag> refTagMatch;
	Glib::RefPtr<Gtk::TextBuffer::TagTable> refTagTable;
	Glib::RefPtr<Gtk::TextBuffer> refBuffer, buff;
	Glib::RefPtr<Gtk::TextBuffer::Mark> refMark;
	Glib::RefPtr<Gtk::TextMark> m_Mark;
	TextIter m_iter;
};

MainClass::MainClass()
{

	refTagMatch = Gtk::TextBuffer::Tag::create();
	refTagMatch->property_background() = "black";
	refTagTable = Gtk::TextBuffer::TagTable::create();
	refBuffer = Gtk::TextBuffer::create(refTagTable);
//	refMark = refBuffer->get_buffer();
m_iter = refBuffer->end();
	refBuffer->set_text("test\n");
	buff = m_TextView.get_buffer();
//	m_iter = buff->get_iter_at_line(1);
	buff->insert(m_iter, "shit\n");

	m_TextView.set_buffer(refBuffer);
//	m_TextView.scroll_to(m_iter, true);
	m_TextView.set_buffer(buff);

}