private void ma_articulos_Click(object sender, EventArgs e)
{
//items fma = new items();
articulos fma = new articulos();
fma.TopLevel = false;
fma.Parent = this;
pn_centro.Controls.Add(fma);
//fma.Location = new Point((pn_centro.Width - fma.Width) / 2, (pn_centro.Height - fma.Height) / 2);
fma.Anchor = AnchorStyles.None;
fma.Show();
fma.BringToFront();
}
