<com:TContent ID="Content">

<com:TImageButton
	ImageUrl="http://pradosoft.github.io/docs/powered.gif"
	Text="Foo"
	ValidationGroup="Foo"
	OnClick="buttonClicked" />
<com:TTextBox ID="FooTextBox" Text="sometext"  />
<com:TRequiredFieldValidator
	ValidationGroup="Foo"
	ControlToValidate="FooTextBox"
	Text="Field required." />

<com:TLabel ID="Result" />

</com:TContent>