why does it take two clicks of a button for custom event to fire?

Question

I have a custom event that is used to alert the main page that a button has been pressed on a usercontrol.

However it takes two clicks for the actions in the main page code behind to take effect.

Usercontrols are loaded inside an update panel

The user control includes the following

public static event EventHandler SignOut;
protected void profileSignOut_Click(object sender, EventArgs e)
    {
        if (SignOut != null)
           SignOut(this, EventArgs.Empty);
    }

the main page contains the following

protected void Page_Load(object sender, EventArgs e)
    {
            Views.Profile.SignOut += Profile_SignOut;
            LoadUserControl();
    }

private void Profile_SignOut(object sender, EventArgs e)
    {
        MenuButtons.Visible = true;
        LastLoadedControl = null;
        LoadUserControl();
    }

and just for completeness, the load user control sections also in default.aspx

private string LastLoadedControl
    {
        get
        {
            return ViewState["LastLoaded"] as string;
        }
        set
        {
            ViewState["LastLoaded"] = value;
        }
    }

    private void LoadUserControl()
    {

        string controlPath = LastLoadedControl;
        ContentPlaceholder.Controls.Clear();

        if (!string.IsNullOrEmpty(controlPath))
        {
            UserControl uc = (UserControl)LoadControl(controlPath);
            ContentPlaceholder.Controls.Add(uc);
        }
    }

Answer 1

Double clicking for events is usually down to a PostBack issue, ie not catering for if (!IsPostBack) in the Page_Load . I not 100% sure what's going on with yours because I haven't yet been required to dynamically load a user control.

But I can offer a slight alternative; if you're wanting to fire a specific event on the parent page from your user control, you can use this:

this.Page.GetType().InvokeMember("MyMethodsName", System.Reflection.BindingFlags.InvokeMethod, null, this.Page, new object[] { });