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POHow to bubble up changes in my ViewModel hierarchy?
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  1. POHow to bubble up changes in my ViewModel hierarchy?
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    copied!<p>My MainView.xaml contains my SmartForm View:</p> <pre><code>&lt;Grid Margin="10"&gt; &lt;views:SmartForm/&gt; &lt;/Grid&gt; </code></pre> <p>the SmartForm view loads an ItemsControl</p> <pre><code>&lt;Grid Margin="10"&gt; &lt;ItemsControl ItemsSource="{Binding DataTypeViews}"/&gt; &lt;/Grid&gt; </code></pre> <p>which is an ObservableCollection of DataTypeViews:</p> <pre><code>List&lt;FormField&gt; formFields = new List&lt;FormField&gt;(); formFields.Add(new FormField { IdCode = "firstName", Label = "First Name", Value = "Jim" }); formFields.Add(new FormField { IdCode = "lastName", Label = "Last Name", Value = "Smith" }); formFields.Add(new FormField { IdCode = "address1", Label = "Address 1", Value = "123 North Ashton Rd." }); formFields.Add(new FormField { IdCode = "address2", Label = "Address 2", Value = "Box 23434" }); formFields.Add(new FormField { IdCode = "city", Label = "City", Value = "New Haven" }); formFields.Add(new FormField { IdCode = "state", Label = "State", Value = "NM" }); formFields.Add(new FormField { IdCode = "zip", Label = "Zip Code", Value = "34234" }); foreach (FormField formField in formFields) { DataTypeView dtv = new DataTypeView(); DataTypeViewModel dtvm = new DataTypeViewModel(formField); dtv.DataContext = dtvm; DataTypeViews.Add(dtv); } </code></pre> <p>and each view shows the label and textbox which builds a form:</p> <pre><code>&lt;Grid&gt; &lt;Grid.ColumnDefinitions&gt; &lt;ColumnDefinition Width="90"/&gt; &lt;ColumnDefinition Width="400"/&gt; &lt;/Grid.ColumnDefinitions&gt; &lt;StackPanel Orientation="Horizontal" Grid.Column="0"&gt; &lt;TextBlock Text="{Binding Label}" FontSize="14"/&gt; &lt;TextBlock Text=": " FontSize="14"/&gt; &lt;/StackPanel&gt; &lt;TextBox Grid.Column="1" Text="{Binding Value}" FontSize="12"/&gt; &lt;/Grid&gt; </code></pre> <p>How do I bubble the Textbox changes that happen in DataTypeViewModel up into SmartFormViewModel?</p> <p>Or in other words: <strong>If ViewModel A contains a collection of ViewModel B, and a change happens in a ViewModel B, how can I bubble that change up to ViewModel A?</strong></p>
 

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