protected void Page_Load(object sender, EventArgs e) { if (!IsPostBack) { btnShowInClient.OnClientClick = Window2.GetShowReference(); btnHideInClient.OnClientClick = Window2.GetHideReference(); btnHideInClient2.OnClientClick = Window2.GetHidePostBackReference("btnHideInClient2"); //PageContext.RegisterStartupScript(Window2.GetShowReference(300, 300)); PageContext.RegisterStartupScript(Window2.GetShowReference() + Window2.GetMaximizeReference()); } }