Coolite.Ext.Web.Panel panel1 = new Coolite.Ext.Web.Panel(); 
panel1.ID = "Panel1";
panel1.Title = "Panel 1";
panel1.Border = false;
panel1.BodyStyle = "padding:6px;";
panel1.Icon = Icon.FolderGo;

Coolite.Ext.Web.Button button1 = new Coolite.Ext.Web.Button();
button1.Text = "Button";

//panel1.Controls.Add(button1);
panel1.Items.Add(button1);
(After that, I add panel1 to a accordion menu)

I've tried with panel1.Controls.Add and panel1.Items.Add (what is the difference?), but the button doesn't show when I run the application.

Do you know why it isn't working?

Thanks!