private void btnCustomers_Click(object sender, EventArgs e)
{
frmCustomers = new frm_Customers(strUsername);
frmCustomers.FormClosed += new FormClosedEventHandler(frmCustomers_FormClosed);
frmCustomers.MdiParent = this;
frmCustomers.Show();
btnCustomers.Enabled = false;
ts_side.Visible = true;
}
private void customerControlToolStripMenuItem_Click(object sender, EventArgs e)
{
frmCustomers = new frm_Customers(strUsername);
frmCustomers.MdiParent = this;
frmCustomers.Show();
}