private void btnSales_Click(object sender, EventArgs e)
{
this.Hide();
SalesRegister salesRegister = new SalesRegister();
salesRegister.Show();
}
private void bunifuFlatButton3_Click(object sender, EventArgs e)
{
foreach (Form form in dbFrmContainer.Controls.OfType <Form>().ToArray())
{
form.Close();
}
SalesRegister l = new SalesRegister();
l.TopLevel = false;
dbFrmContainer.Controls.Add(l);
l.Show();
}