[ToolboxData(<span class="code-string">"</span><span class="code-string"><{0}:ModalForm runat="</span>server<span class="code-string">"</span><span class="code-string">>"</span>)]<br /><span class=”code-keyword”>public</span> <span class=”code-keyword”>class</span> ModalForm : Panel<br />{<br /> <span class=”code-keyword”>public</span> ModalForm() : base()<br /> {}<br />}<br /><br />Very good article <a target=”_blank” href=”http://www.codeproject.com/KB/aspnet/SmumModalForm.aspx”>here</a>.<br />