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POSilverlight - bind from DataGrid column back to root property of view model?
 

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    <p>I have the following XAML:</p> <pre><code>&lt;UserControl.Resources&gt; &lt;local:MainPageViewModel x:Key="ViewModel" /&gt; &lt;/UserControl.Resources&gt; &lt;Grid x:Name="LayoutRoot" DataContext="{Binding Source={StaticResource ViewModel}}"&gt; &lt;sdk:DataGrid AutoGenerateColumns="False" ItemsSource="{Binding Items}"&gt; &lt;sdk:DataGrid.Columns&gt; &lt;sdk:DataGridTextColumn Header="ID" Binding="{Binding ID}" /&gt; &lt;sdk:DataGridTextColumn Header="Name" Binding="{Binding Name}" /&gt; &lt;sdk:DataGridCheckBoxColumn Header="Checkbox Column" Binding="{Binding Source={StaticResource ViewModel}, Path=SomeBooleanProperty}"/&gt; &lt;/sdk:DataGrid.Columns&gt; &lt;/sdk:DataGrid&gt; &lt;/Grid&gt; </code></pre> <p>So, basically I want to have one of the columns (the checkbox column) bound to some property (SomeBooleanProperty) that is directly on the ViewModel, as opposed to a property on one of the items in the Items collection. (Yes this is a bit contrived, but it gets to my problem.) The problem is that based on my testing, if you bind via the StaticResource, it seems like the value isn't updated based on INotifyPropertyChanged event firing. The initial value is correct, but it never changes. I can't figure out another way to get "out" of the Items binding and back up to the ViewModel, from within a column binding.</p> <p>I think that in WPF you could do this with a RelativeBinding using FindAncestor. But that functionality doesn't exist in Silverlight. Are there other ways to accomplish this?</p>
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    1. USRationalGeek
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    1. CO+1 Great question! You've got me curious now as well. Could you simply make sure that the property name is not a property that exists in your item source? I thought that it defaults to the view model if the property is not a member of the item source.
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      1. USKavet Kerek
    2. COCould you provide some of your source code. I tried exactly your xaml an it works. Maybe some of your ViewModel source would be helpful to locate the problem.
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      1. USTerenceJackson
    3. CO@TerenceJackson: looks like you are right. I rebuilt the page and it worked. See my answer below.
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