Hello,

Could you please try the following code sample and see if it helps:

        private void ultraTextEditor1_ControlAdded(object sender, ControlEventArgs e)
        {
            EmbeddableTextBoxWithUIPermissions textbox = (EmbeddableTextBoxWithUIPermissions)e.Control;
            textbox.ShortcutsEnabled = false;
        }

 Please let me know if the above is good enough for you.