Description of problem:
If user implements his own validation through Automate methods, there is no way to display the methods in Dialog User in a consistent way with other validation methods.
The only way to inform about an error is to display the error message inside of TextBox/TextArea.
The goal is to provide a way to display error messages from Automate methods in Dialog User.
Please assess the impact of this issue and update the severity accordingly. Please refer to https://bugzilla.redhat.com/page.cgi?id=fields.html#bug_severity for a reminder on each severity's definition.
If it's something like a tracker bug where it doesn't matter, please set the severity to Low.