WPF: Visibility binding, event = null

I have the following code:

    public event EventHandler LoadingControlVisibilityChanged;
    public Visibility LoadingControlVisibility
    {
        get { return _LoadingControlVisibility; }
        set
        {
            _LoadingControlVisibility = value;
            if (LoadingControlVisibilityChanged != null)
                LoadingControlVisibilityChanged(this, EventArgs.Empty);
        }
    }

<Label x:Name="loading" Visibility="{Binding Path=LoadingControlVisibility, Mode=OneWay}" Content="No Devices Detected!" FontFamily="{DynamicResource AppFont}" HorizontalAlignment="Left" Margin="110,0,0,0" FontSize="21.333" />

The first time the binding work, but after I change the LoadingControlVisibility nothing happens, after debug I notice that the event = null. Please help me solve this problem.

my text property works with no problems:

    public event EventHandler UUidChanged;
    public开发者_运维技巧 string UUid
    {
        get { return _uuid; }
        set
        {
            _uuid = value;
            if (UUidChanged != null) UUidChanged(this, EventArgs.Empty);
        }
    }
<TextBox Text="{Binding Path=UUid, Mode=OneWay}" Margin="122.48,11.26,9,0" TextWrapping="Wrap" VerticalAlignment="Top" FontSize="{DynamicResource MediumFontSize}" FontFamily="{DynamicResource AppFont}" Template="{DynamicResource TxtBoxTemplate}" Height="25" >

why is this different ?

---

The Binding statement will not look for the event you have defined. You must implement INotifyPropertyChanged instead.

---

I'm not quite certain what you're trying to accomplish. My understanding is that you are trying to bind the visibility of your label to a Property named LoadingControlVisibility that is defined in another class. If that is the case, then your path is wrong in the binding. Your binding should be as follows: Visibility="{Binding LoadingControlVisibility}"