Set "Visibility" is "Collapsed" in ListBox.ItemContainerStyle

[Bill]

Hi,telerik:
I want to show some images in the listbox with VirtualizingWrapPanel and some will not. It depends on the property(IsDefault) that i have defined.
here is the code:

<P><ListBox.ItemContainerStyle><BR>
<Style TargetType="{x:Type
ListBoxItem}"><BR>
<Style.Triggers><BR>
<DataTrigger Binding="{Binding IsDefault}"
Value="true"><BR>
<Setter Property="Visibility"
Value="Collapsed"/><BR>
</DataTrigger></P>
<P>                       </P>
<P>
</Style.Triggers><BR>
</Style><BR>
</ListBox.ItemContainerStyle><BR></P>

but even through the value of the "IsDefault" is set to "true",the listboxitem still display in the listbox ,and the item is blank.
How do I do before they can get the effect I want?
Thanks and Regards,
Bill.

[Chuck]

I know this is an old post, but this might help someone. If "IsDefault" isn't a dependency property, make it one with a callback. Similar to:

public bool ShowHidden
{
    get { return (bool)GetValue(ShowHiddenProperty); }
    set { SetValue(ShowHiddenProperty, value); }
}

public static readonly DependencyProperty ShowHiddenProperty =
    DependencyProperty.Register("ShowHidden", typeof(bool), typeof(TileLoader), new PropertyMetadata(false, ShowHidden_Callback));

private static void ShowHidden_Callback(DependencyObject d, DependencyPropertyChangedEventArgs e)
{
    TileLoader _this = d as TileLoader;
    if (!_this.dpConstructorDone) return; // prevent constructor doing a refresh (and getting an error)

                                           // if you set the property value in the constructor on load

    bool value = (bool)e.NewValue;
    // do something with value here if you want
    _this.View.CollectionView.Refresh();
}

Then create a collection view with a filter for your ListBox

View.CollectionView = CollectionViewSource.GetDefaultView(View.Images);
View.CollectionView.Filter = oImage =>
{
    var image = (ImageDTO)oImage;
    if (image.IsHidden && !ShowHidden) return false;
    if (string.IsNullOrWhiteSpace(Search))
        return true;
    return image.Name.ToLower().Contains(Search.ToLower());
};

I also have a Search textbox, so my filter includes that. So when you refresh your collection view, Then you won't be displaying your hidden items (and there won't be blank boxes either.)