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    <blockquote> <p>I am using MVVM and I am binding both the Datagrid s by ObservableCollections on Viewmodel.</p> </blockquote> <p>You should have only one <code>ObservableCollection</code> (<code>MatchObsCollection</code>) in your ViewModel. If you have <code>MatchObsCollection</code> and <code>SubBetMatchDataListforChildGrid</code> in ViewModel this code doesn't work.</p> <p>The <code>DataContext</code> of the <code>RowDetails</code> is the row item.</p> <p>So if you want to binding to the <code>ObservableCollection</code> in the ViewModel you should use following code in <code>RowDetailsTemplate</code>:</p> <pre><code>... &lt;DataGrid.RowDetailsTemplate x:Uid="test123"&gt; &lt;DataTemplate x:Name="testTemplete"&gt; &lt;DataGrid x:Name="innerGrid" ItemsSource="{Binding Path=DataContext.SubBetMatchDataListforChildGrid, RelativeSource={RelativeSource Mode=FindAncestor, AncestorType={x:Type Window}}}" ... </code></pre> <p>If you want to binding to selected object inner <code>ObservableCollection</code> your classes should looks like this:</p> <pre><code>class Foo { public int MatchNo { get; set; } public DateTime MatchDate { get; set; } // more properties public ObservableCollection&lt;Boo&gt; SubBetMatchDataListforChildGrid { get; set; } } class Boo { public string Code { get; set; } public string SubOptions { get; set; } } </code></pre> <p>And in the ViewModel you should have <code>ObservableCollection</code> of Foo:</p> <pre><code>class MainViewModel { public ObservableCollection&lt;Foo&gt; MatchObsCollection { get; set; } } </code></pre>
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    1. COmany many thanks for your valuable code and elaborate explanation.I have a small request I am new to MVVM.I do post many question here if possible please answer whenever possible.
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      1. USAnindya Chatterjee
    2. CO@AnindyaChatterjee if it helped you, mark it as answer http://meta.stackexchange.com/a/5235
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    3. COI have made it as answer.
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      1. USAnindya Chatterjee
 

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Guidance
A row detail

Detail views are divided into sections. All the information in the data section comes from columns in the selected row. The other sections display data from other, related rows.

Related data can be related in a to-one or a to-many fashion. Captions of data related in a to-many fashion link to a list view showing a filtered view of the table.

Try moving around until you find a non-empty to-many entry and click on the label to get to one. You can move back to the root by clicking on the database name in the header.

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