<com:TContent ID="Content">

<com:TPanel DefaultButton="button1">
Panel 1
<com:TTextBox />
<com:TButton ID="button1" Text="Button 1" OnClick="button_clicked" />
</com:TPanel>

<com:TPanel DefaultButton="button2">
Panel 2
<com:TTextBox />
<com:TButton ID="button2" Text="Button 2" OnClick="button_clicked" />
</com:TPanel>

<com:TLabel ID="label1" />

</com:TContent>