/// <summary>
/// This assigns the instance property of the new child form to a variable called entryInstance, sets it as an MDI child and displays it.
/// </summary>
private void WindowNewCustomerEntry(object sender, EventArgs e)
{
// Create or call instance of the child below.
formCustomerEntry entryInstance = formCustomerEntry.Instance;
// Assign this child window an MdiParent
entryInstance.MdiParent = this;
// Display this instance and if it's already visible put focus on it.
entryInstance.Show();
entryInstance.Focus();
}
/// <summary>
/// When this form is closed, release the instance.
/// </summary>
private void CustomerFormClosed(object sender, FormClosedEventArgs e)
{
instance = null;
}