Set required to true for ValidationTextBox
<html>
<head>
<link rel="StyleSheet" type="text/css"
href="js/dojo/dijit/themes/tundra/tundra.css">
<script type="text/javascript">
var djConfig = {
baseScriptUri : "js/dojo/",
parseOnLoad : true
};
</script>
<script type="text/javascript" src="js/dojo/dojo/dojo.js"></script>
<script>
dojo.require("dojo.parser");
dojo.require("dijit.form.ValidationTextBox");
</script>
</head>
<body class="tundra">
<div class="formContainer">
<form action="" method="get" name="custForm">
<label for="firstName">Name: </label>
<input type="text" id="firstName" name="firstName"
dojoType="dijit.form.ValidationTextBox"
required="true"
propercase="true"
promptMessage="Enter first name."
invalidMessage="First name is required."
trim="true"
style="width: 10em;"
/>
</form>
</div>
</body>
</html>
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