+void modest_header_view_refilter (ModestHeaderView *header_view);
+
+/**
+ * modest_header_view_set_filter:
+ * @self: a #ModestHeaderView
+ * @filter: a filter mask to be applied to messages
+ *
+ * sets the special filter to be applied (affects visibility of items).
+ * It's a mask, and filters applied are applied with an AND.
+ */
+void modest_header_view_set_filter (ModestHeaderView *self,
+ ModestHeaderViewFilter filter);
+
+/**
+ * modest_header_view_unset_filter:
+ * @self: a #ModestHeaderView
+ * @filter: a filter mask to be unapplied to headers
+ *
+ * Unsets the special filter to be applied (affects visibility of
+ * items). It's a mask, and filters applied are applied with an AND.
+ */
+void modest_header_view_unset_filter (ModestHeaderView *self,
+ ModestHeaderViewFilter filter);
+
+
+
+/**
+ * modest_header_view_add_observer:
+ * @header_view: a #ModestHeaderView
+ * @observer: The observer to notify.
+ *
+ * Registers a new observer. Warning! Each added observer object must
+ * removed using @modest_header_view_remove_observer before destroying
+ * the observer, or at least when it is under destruction. Also you
+ * should care about that the observer's #update function might be
+ * called any time until the observer is removed.
+ **/
+void modest_header_view_add_observer(
+ ModestHeaderView *header_view,
+ ModestHeaderViewObserver *observer);
+
+/**
+ * modest_header_view_remove_observer:
+ * @header_view: a #ModestHeaderView
+ * @observer: The observer to remove.
+ *
+ * Removes exactly one observer from the notification list. If you
+ * added an observer twice, you should call this remove funtion twice
+ * as well.
+ **/
+void modest_header_view_remove_observer(
+ ModestHeaderView *header_view,
+ ModestHeaderViewObserver *observer);
+
+/**
+ * modest_header_view_get_header_at_pos:
+ * @header_view: a #ModestHeaderView
+ * @initial_x: the x coordinate
+ * @initial_y: the y coordinate
+ *
+ * Return the #TnyHeader stored in the row at (x,y) coordinates
+ * relatives to the widget. It returns a new reference so you must
+ * unref it once you're done with it.
+ *
+ * Returns: a #TnyHeader if found, else NULL
+ **/
+TnyHeader* modest_header_view_get_header_at_pos (ModestHeaderView *header_view,
+ gint initial_x,
+ gint initial_y);
+