private void AbrirForm <SubForm>() where SubForm : Form, new()
{
Form frmChild = new Form();
frmChild = pnlChildForms.Controls.OfType <SubForm>().FirstOrDefault();
if (frmChild == null)
{
frmChild = new SubForm();
frmChild.TopLevel = false;
frmChild.Dock = DockStyle.Fill;
pnlChildForms.Controls.Add(frmChild);
pnlChildForms.Tag = frmChild;
frmChild.Show();
frmChild.BringToFront();
}
else
{
frmChild.BringToFront();
}
}