Displaying informational message to user on work item save

We have a work item save operation participant and need on occasion to display an informational message to the end user on a successful work item save. I tried the following code in the operation participant:

String message = "This is an informational message";

IReportInfo info = collector.createInfo( "This is a test", message );

collector.addInfo( info );

The message does display when using the Eclipse Client in the Team Advisor View, but only if if the user selects Show Detail Tree, expands the Work Item Save, and selects the message. This is not intuitive to the end user. Furthermore, I don't see any way to see the message in Web Client.

What is proper way to display an informational message to the end user on a work item save so that it is always intuitively shown in both the Eclipse and Web clients?