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13:07, 18 May 2017 A collection of property-based content filtering criteria can be applied to child object lists. {{Version/WinXSince|2.6.1}} Some common use cases are as follows.
* A user can enter a text to reduce the entire child list to a sub list of those whose certain property display values contain that text;
* A customizer can create UI that presents several text input fields serving as such filters, with each applied to a different property.
For example. One can customize the ChildArea template to include the following.
<source lang = "xml">
<Grid>
<Border Background="#8000488E" Visibility="{Binding Children.Filters[SomePropertyName], Converter={StaticResource NullObjOrEmptyStrColConverter}}" />
<Border Background="#90707070" Visibility="{Binding Children.Filters[SomePropertyName], Converter={StaticResource NullObjOrEmptyStrVisConverter}}" />
<TextBox Text="{Binding Children.Filters[SomePropertyName], Mode=TwoWay, Converter={StaticResource FilterCriterionToValueConverter}}"
PlaceholderText="SomePropertyName" BorderThickness="0" Foreground="White" Background="Transparent" />
</Grid>
</source>
This is shown as a single text box. The two way binding on Text allows the entered text (case insensitive) to be used as the filter value on property "SomePropertyName" (case sensitive).
For performance/usability reasons, the result list is not immediately refreshed as one types in the text box. Instead, it only happens after the [[ReloadChildListCommand]] is triggered.
{{Hint|The Borders in the example are not mandatory, they serve as indicators of whether a filter is currently applied on the result list. The PlaceHolderText is optional as well.}}