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2012-04-12T14:10:34.627
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Add an <code>ICommand</code> to your <code>MainViewModel</code> for adding a new item to your <code>ObservableCollection</code>, and use a <code>RelativeSource</code> binding to find the command from within the <code>TabItem</code> So your MainViewModel would have <pre class="lang-cs prettyprint-override"><code>ObservableCollection<IViewModel> TabItems IViewModel SelectedTabItem ICommand AddTabCommand </code></pre> where <code>AddTabCommand</code> basically does <pre class="lang-cs prettyprint-override"><code>void AddTab(IViewModel newItem) { TabItems.Add(newItem); SelectedTabItem = newItem; } </code></pre> and your UI would look something along the lines of this <pre><code><DataTemplate DataType="{x:Type local:SelectReportViewModel}"> <Grid> ...  <Button Command="{Binding DataContext.AddTabCommand, RelativeSource={RelativeSource AncestorType={x:Type TabControl}}}" /> ... </Grid> </DataTemplate> <TabControl ItemsSource="{Binding TabItems}" /> </code></pre> Another alternative is to use some kind of event system, such as MVVM Light's <code>Messenger</code> or Microsoft Prism's <code>EventAggregator</code>, to broadcast/subscribe to events. Your <code>MainViewModel</code> would subscribe to <code>AddTabEvents</code>, while your <code>SelectReportViewModel</code> would broadcast those events anytime a new tab should be added. I have a brief summary on my blog article about <a href="http://rachel53461.wordpress.com/2011/06/05/communication-between-viewmodels-with-mvvm/" rel="nofollow">communication between ViewModels</a> if you're interested.
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1. POAdding tabs to tabcontrol from inside a tab
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1. COThis looks promising. I was actually looking for something like this but never heard of it as I am relatively new to WPF. Never had an idea as to how to communicate from one VM to another. Will implement and let you know how it's going.
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2. COAwesome... It worked... I used the Event Aggregator pattern... Worked like a charm... So many thanks... :)
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