+
+/**
+ * modest_tny_header_tree_view_set_columns:
+ * @self: a ModestTnyHeaderTreeView instance
+ * @columns: a list of ModestTnyHeaderTreeViewColumn
+ *
+ * set the columns for this ModestTnyHeaderTreeView
+ *
+ * Returns: TRUE if it succeeded, FALSE otherwise
+ */
+gboolean modest_tny_header_tree_view_set_columns (ModestTnyHeaderTreeView *self,
+ GSList *columns);
+/**
+ * modest_tny_header_tree_view_get_columns:
+ * @self: a ModestTnyHeaderTreeView instance
+ * @folder: a TnyMsgFolderIface object
+ *
+ * get the columns for this ModestTnyHeaderTreeView
+ *
+ * Returns: list of columms, or NULL in case of no columns or error
+ */
+const GSList* modest_tny_header_tree_view_get_columns (ModestTnyHeaderTreeView *self);
+
+
+/**
+ * modest_tny_header_tree_view_set_style:
+ * @self: a ModestTnyHeaderTreeView instance
+ * @style: the style for this tree view
+ *
+ * set the folder for this ModestTnyHeaderTreeView
+ *
+ * Returns: TRUE if it succeeded, FALSE otherwise
+ */
+gboolean modest_tny_header_tree_view_set_style (ModestTnyHeaderTreeView *self,
+ ModestTnyHeaderTreeViewStyle style);
+
+/**
+ * modest_tny_header_tree_view_set_folder:
+ * @self: a ModestTnyHeaderTreeView instance
+ * @folder: a TnyMsgFolderIface object
+ *
+ * set the folder for this ModestTnyHeaderTreeView
+ *
+ * Returns: TRUE if it succeeded, FALSE otherwise
+ */
+ModestTnyHeaderTreeViewStyle modest_tny_header_tree_view_get_style (ModestTnyHeaderTreeView *self);
+