[ Version ( since = "2.12" ) ]
public string tooltip_text { owned get; set; }
Sets the text of tooltip to be the given string.
Also see set_text.
This is a convenience property which will take care of getting the tooltip shown if the given string is not null: has_tooltip will automatically be set to true and there will be taken care of query_tooltip in the default signal handler.
Note that if both tooltip_text and tooltip_markup are set, the last one wins.