Another way to add a tool tip associate to a Field.

this method works well for FieldSet used with dummy table.

models/dummy.py

@@ -12,8 +12,10 @@
 dummy = DAL(None)
 
 # the report node with selector
+tp_string = "tool tip for the string"
+
 dummy.define_table("foo1",
-    Field('my_string', 'string'),
+    Field('my_string', 'string', label= "<span ext:qtip='%s'>%s</span>" % (tp_string, "My String:")),
     Field('my_int', 'integer', requires=IS_INT_IN_RANGE(0, 100)),
     Field('my_date', 'date'),
     Field('my_format', default='html', requires=IS_IN_SET(['html', 'latex', 'pdf'])))