[Building Sakai] How to use addAlert(state, string) in AssignmentAction.java (Assignment tool)

[le tan vu]

Hello everybody.
I'm on the way modifying Assignment tool in order to provide better tool for
our faculty.
In order to display warning on a vm file, I saw that you use addAlert(state,
string). But when I try to do the same thing, the warning does not display.
Please show me how to use that function fully if you know.
Thanks in advanced.
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