Builds an extension function that will install a dynamic tooltip. The
tooltip message should include the string '%1' and that string will be
replaced with the text of the named field.
Parameters
msgTemplate: string
The template form to of the message text, with
%1 placeholder.
Builds an extension function that will install a dynamic tooltip. The tooltip message should include the string '%1' and that string will be replaced with the text of the named field.