<com:TContent ID="Content">

Global state:
<com:TTextBox ID="TextBox2" />
<com:TButton Text="Submit" OnClick="updateGlobal" />

<br/>

Your input:
<com:TTextBox ID="TextBox" />
<com:TButton Text="Submit" ValidationGroup="Foo" OnClick="buttonClicked" />
<com:TCustomValidator
	ValidationGroup="Foo"
	ControlToValidate="TextBox"
	Text="Your input must match the global state."
	OnServerValidate="customValidation" />
<br/>

</com:TContent>