Hi Steve,

Thanks for your feedback.

Yes, if our ToolBar reference is private, we can not register the event
handler directly. For this, I have 2 options:
1. Create a public method in Base form. This method takes 1 parameter as
type [YourToolBarSpecific]EventHandler and registers Toolbar event in this
method, then in child Form, we can invoke this method with a valid
eventhandler. Sample code like this:
//In main form
public void ButtonAddHandler(EventHandler eh)
{
    this.button1.Click+=eh;
}

private void button2_Click(object sender, System.EventArgs e)
{
    Form2 f=new Form2(this);
}
//In child form
public Form2(Form1 f)
{
    f.ButtonAddHandler(new EventHandler(f_Click));
    InitializeComponent();
}
private void f_Click(object sender, EventArgs e)
{
    MessageBox.Show("hehe");
}

2. Just modifiy the ToolBar modifier as public

Hope this helps
=====================================================
Thank you for your patience and cooperation. If you have any questions or
concerns, please feel free to post it in the group. I am standing by to be
of assistance.

Best regards,
Jeffrey Tan
Microsoft Online Partner Support

Hi Steve,

Does my reply make sense to you? Is your problem resolved? Please feel free
to tell me, thanks

Best regards,
Jeffrey Tan
Microsoft Online Partner Support