Hi,
see this code
i get the loading mask in top corner page....
ScriptManager1.AddScript("{0}.iframe.remove();", Tab1.ClientID);
ScriptManager1.AddScript("delete {0}.iframe;", Tab1.ClientID);
Tab1.AutoLoad.Url = "Frm_Company_Buisness.aspx";
Tab1.AutoLoad.Mode = LoadMode.IFrame;
Tab1.LoadMask.ShowMask = true;
Tab1.LoadMask.Msg = Lstr_load;
Tab1.LoadContent();
Tab1.Title = baseds.Tables[2].Rows[0]["B-0162"].ToString();
TabPanel1.AddScript("{0}.closeTab({1}, 'hide');", TabPanel1.ClientID, Tab2.ClientID);
TabPanel1.ActiveTabIndex = 0;
Session["P_Reload"] = "Frm_Company_Buisness.aspx";
Tab2.Disabled = true;
ScriptManager1.AddScript("parent.window.Ext.getCmp('pnlSettings').setDisabled(true);");