fix

git-svn-id: http://svn.net-core.org/repos/t-engine4@3903 51575b47-30f0-44d4-a5cc-537603b46e54

game/engines/default/engine/Tooltip.lua

@@ -79,6 +79,7 @@ end
 --- Set the tooltip text
 function _M:set(str, ...)
 	if type(str) == "string" then str = str:format(...):toTString() end
+	if type(str) == "number" then str = tostring(str):toTString() end
 
 	if str.is_tstring then
 		self:erase()