<com:TContent ID="Content"> <h1>Composite Control Test</h1> <com:LabeledTextBox id="user" Label.Text="username:" /><br /> <com:LabeledTextBox id="pass" Label.Text="password:" /><br /> <com:TButton Text="Submit" /> <com:TPanel Visible=<%= $this->user->TextBox->Text != "" %> > <h2>Result</h2> User: <%= $this->user->TextBox->Text %> Pass: <%= $this->pass->TextBox->Text %> </com:TPanel> </com:TContent>