diff -r 42506e19eb6b -r 25e5390cce41 ui/gtk/container.c
--- a/ui/gtk/container.c	Fri Jun 13 10:39:54 2014 +0200
+++ b/ui/gtk/container.c	Tue Jul 22 09:51:17 2014 +0200
@@ -101,3 +101,74 @@
 void ui_box_add(UiContainer *ct, GtkWidget *widget) {
     gtk_box_pack_start(GTK_BOX(ct->widget), widget, TRUE, TRUE, 0);
 }
+
+
+
+
+static void page_change(GtkNotebook *notebook, GtkWidget *page, guint page_num, gpointer data) {
+    GQuark q = g_quark_from_static_string("ui.tab.object");
+    UiObject *tab = g_object_get_qdata(G_OBJECT(page), q);
+    if(!tab) {
+        return;
+    }
+    
+    printf("page_change: %d\n", page_num);
+    UiContext *ctx = tab->ctx;
+    ctx->parent->set_document(ctx->parent, ctx->document);
+}
+
+UiTabbedPane* ui_tabbed_document_view(UiObject *obj) {
+    GtkWidget *tabview = gtk_notebook_new();
+    gtk_notebook_set_show_border(GTK_NOTEBOOK(tabview), FALSE);
+    
+    g_signal_connect(
+                tabview,
+                "switch-page",
+                G_CALLBACK(page_change),
+                NULL);
+    
+    UiContainer *ct = uic_get_current_container(obj);
+    ct->add(ct, tabview);
+    
+    UiTabbedPane *tabbedpane = ui_malloc(obj->ctx, sizeof(UiTabbedPane));
+    tabbedpane->ctx = uic_current_obj(obj)->ctx;
+    tabbedpane->widget = tabview;
+    tabbedpane->document = NULL;
+    
+    return tabbedpane;
+}
+
+UiObject* ui_document_tab(UiTabbedPane *view) {
+    GtkWidget *frame = gtk_alignment_new(0.5, 0.5, 1, 1);
+    // TODO: label
+    gtk_notebook_append_page(GTK_NOTEBOOK(view->widget), frame, NULL);
+    
+    UiObject *tab = ui_malloc(view->ctx, sizeof(UiObject));
+    tab->widget = NULL; // initialization for uic_context()
+    tab->ctx = uic_context(tab, view->ctx->mempool);
+    tab->ctx->parent = view->ctx;
+    tab->ctx->set_document = ui_tab_set_document;
+    tab->ctx->detach_document = ui_tab_detach_document;
+    tab->widget = frame;
+    tab->window = view->ctx->obj->window;
+    tab->container = ui_frame_container(tab, frame);
+    tab->next = NULL;
+    
+    GQuark q = g_quark_from_static_string("ui.tab.object");
+    g_object_set_qdata(G_OBJECT(frame), q, tab);
+    
+    return tab;
+}
+
+void ui_tab_set_document(UiContext *ctx, void *document) {
+    if(ctx->parent->document) {
+        //ctx->parent->detach_document(ctx->parent, ctx->parent->document);
+    }
+    uic_context_set_document(ctx, document);
+    //uic_context_set_document(ctx->parent, document);
+    //ctx->parent->document = document;
+}
+
+void ui_tab_detach_document(UiContext *ctx, void *document) {
+    uic_context_detach_document(ctx->parent, document);
+}