private void agregarBotonLogout()
{
ToolStripButton boton = generarBoton("Cerrar sesión",100);
boton.Alignment = ToolStripItemAlignment.Right;
boton.Margin = new Padding(0, 0, 25, 0);
boton.Click += new System.EventHandler(salir_Click);
menu.Items.Add(boton);
}