Custom control : Action buttons are "alive" now

- show tooltips for buttons
- LBtnClick invokes revert functions for the field

src/slic3r/GUI/Tab.hpp

@@ -77,6 +77,7 @@ public:
     void        clear();
     void        msw_rescale();
     void        sys_color_changed();
+    void        refresh();
 	Field*		get_field(const t_config_option_key& opt_key, int opt_index = -1) const;
 	bool		set_value(const t_config_option_key& opt_key, const boost::any& value);
 	ConfigOptionsGroupShp	new_optgroup(const wxString& title, int noncommon_label_width = -1);