$(document).ready(function() {
    Sys.WebForms.PageRequestManager.getInstance().add_initializeRequest(function(sender, args) {
        if (Sys.WebForms.PageRequestManager.getInstance().get_isInAsyncPostBack()) {
            args.set_cancel(true);
        }
    });

    Sys.WebForms.PageRequestManager.getInstance().add_endRequest(function(sender, args) {
        if($.modal != null)
            $.modal.close();
    });
});