* @param view_constructor constructor of the viewer.
*/
-void ToolbarItemReg(GdkPixmap * pixmap, char *tooltip, void *view_constructor);
+void ToolbarItemReg(char ** pixmap, char *tooltip, lttv_constructor view_constructor);
/**
* a reference to find out where the pixmap and tooltip are.
*/
-void ToolbarItemUnreg(void *view_constructor);
+void ToolbarItemUnreg(lttv_constructor view_constructor);
/**
* @param view_constructor constructor of the viewer.
*/
-void MenuItemReg(char *menu_path, char *menu_text, void *view_constructor);
+void MenuItemReg(char *menu_path, char *menu_text, lttv_constructor view_constructor);
/**
* a reference to find out where the menu_path and menu_text are.
*/
-void MenuItemUnreg(void *view_constructor);
+void MenuItemUnreg(lttv_constructor view_constructor);
/**