how can an event in usercontrol get detected by the main aspx page?

Question

How can I "bubble" up an event from a usercontrol to the main page? However the usercontrol is not always loaded as I am using update panels to ajax in different usercontrols.

I have found this but it assumes the usercontrol is always loaded?

Edit: I looked at tutorials but for some reason it takes two for the event work.

This is the button to be pressed and its code behind callback

<asp:button runat="server" ID="profileSignOut" CssClass="btn btn-default" OnClick="profileSignOut_Click" Text="Sign Out"/>

protected void profileSignOut_Click(object sender, EventArgs e)
    {
        infoTB.Text += "\nclicked";
        Session.Clear();
        Session.Abandon();
        if (SignOut != null)
        SignOut(this, EventArgs.Empty);
    }

The event defined in the usercontrol, had to be static otherwise the event handler in the main page would throw an error

public static event EventHandler SignOut;

and the handler in the main page

protected void Page_Load(object sender, EventArgs e)
    {
        Views.Profile.SignOut += new EventHandler(signOutEvent);
        LoadUserControl();
    }
private void signOutEvent(Object sender, EventArgs e)
    {
        MenuButtons.Visible = true;
        LastLoadedControl = null;
        LoadUserControl();
    }