<com:TContent ID="Content">

	<com:THtmlArea ID="text1" />

	<com:TRequiredFieldValidator 
		ControlToValidate="text1"
		ErrorMessage="*" />

	<com:TButton ID="button1" Text="submit 1" />

	<com:TButton ID="button2" Text="submit 2" />

	<com:THtmlArea ID="text2" />

	<com:TRequiredFieldValidator 
		ControlToValidate="text2"
		ValidationGroup="group2"
		ErrorMessage="*" />

	<com:TButton ID="button3" ValidationGroup="group2" Text="submit 3" />

	<com:TButton ID="button4" ValidationGroup="group2" Text="submit 4" />

</com:TContent>