XAML databinding not updating

Question

just need a little help with some databinding.

So I have an ObservableCollection of a custom object. The properties of the object are as shown:

    /// <summary>
    /// Name
    /// </summary>
    private string _name;
    public string Name
    {
        get
        {
            return _name;
        }
        set
        {
            if (value != _name)
            {
                _name = value;
                NotifyPropertyChanged("Name");
            }
        }
    }        

    /// <summary>
    /// Status
    /// </summary>
    private int _status;
    public int Status
    {
        get
        {
            return _status;
        }
        set
        {
            if (value != _status)
            {
                _status = value;
                NotifyPropertyChanged("Status");
            }
        }
    }

    /// <summary>
    /// Visible information
    /// </summary>
    private Visibility _visible;
    public Visibility Visible
    {
        get
        {
            return _visible;
        }
        set
        {
            if (value != _visible)
            {
                _visible = value;
                NotifyPropertyChanged("Visible");
            }
        }
    }

    public event PropertyChangedEventHandler PropertyChanged;
    private void NotifyPropertyChanged(String propertyName)
    {
        PropertyChangedEventHandler handler = PropertyChanged;
        if (null != handler)
        {
            handler(this, new PropertyChangedEventArgs(propertyName));
        }
    }

And basically I have three TextBlocks, the first two of which have Text binded to Name and Status while the third has:

Visibility = {Binding Visible}

But whenever I want to toggle the visibility property, I can only toggle it from the Visible state to Collapsed, and then not again. My toggle looks like this:

            ItemViewModel l = ((sender as LongListSelector).SelectedItem) as ItemViewModel;
            MessageBox.Show(l.Visible.ToString());
            if (l.Visible == Visibility.Collapsed)
                l.Visible = Visibility.Visible;
            else
                l.Visible = Visibility.Collapsed;

Note: ItemViewModel is the custom class for the collection, ie.

ObservableCollection<ItemViewModel>

Obviously it's just a rough test, but still doesn't work. The messagebox is always showing "Visible" regardless of the real visibility state of the item. How can I get it to get the real value of Visibility?

If anyone has any idea, that would be great.

Thanks.

EDIT: Adding XAML for the Textblocks for clarity:

<TextBlock Text="{Binding Name}" TextWrapping="Wrap" Style="{StaticResource PhoneTextExtraLargeStyle}" FontSize="20"/>
<TextBlock Text="{Binding Status}" TextWrapping="Wrap" Margin="12,-6,280,0" Style="{StaticResource PhoneTextSubtleStyle}"/>
<TextBlock x:Name="t1" Text="Test for visibility" TextWrapping="Wrap" Margin="12,-6,12,0" Style="{StaticResource PhoneTextSubtleStyle}" Visibility="{Binding Visible}"/>

Keep in mind these textblocks are encased within a stackpanel and a longlistselector so simply changing t1.Visible is out of the question.

Answer 1

The problem, after more investigation, ends up being that the property was being set by another branch of code.