private void materia_FormClosed(object sender, FormClosedEventArgs e)
{
materia = null;
agregar = null;
insumos = null;
producto = null;
Existe = null;
}
private void Abrir_Agregar()
{
if (agregar == null)
{
agregar = new Agregar();
agregar.Owner = this;
agregar.FormClosed += materia_FormClosed;
agregar.Show();
}
else
{
materia.Activate();
}
}