+void pspp_sheet_view_column_size_request (PsppSheetViewColumn *tree_column,
+ GtkRequisition *requisition);
+
+void pspp_sheet_view_column_size_allocate (PsppSheetViewColumn *tree_column,
+ GtkAllocation *allocation);
+gboolean pspp_sheet_view_column_can_focus (PsppSheetViewColumn *tree_column);
+void pspp_sheet_view_column_set_need_button (PsppSheetViewColumn *tree_column,
+ gboolean need_button);