private void ProveedoresToolStripMenuItem_Click(object sender, EventArgs e)
{
FormProveedores ventanap = new FormProveedores();
ventanap.MdiParent = this;
ventanap.Show();
}
private void Form1_Load(object sender, EventArgs e)
{
Frm2 = new FormProveedores();
Frm2.MdiParent = this;
Frm2.Show();
}