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POSilverlight DataBinding to a ReadOnlyObservableCollection only fires the first time
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  1. POSilverlight DataBinding to a ReadOnlyObservableCollection only fires the first time
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    copied!<p>in my Silverlight 4 project, I like to bind an ReadOnlyObservableCollection to a Button Property. The collection is part of a class, which binds to the DataContect of the UserControl, that contains the Button.</p> <pre><code>&lt;Button Visibility="{Binding Children, Converter={StaticResource ConvertHasListItems2Visibility}}" /&gt; </code></pre> <p>The converter is called the first time, when the control is created, but after that, it isn't called when I add or remove items to the collection. I checked this with breakpoints. I even tried to bind to an ObservableCollection, but there is the same problem. Binding to another property of my class works (my class implements INotifyPropertyChanged).</p> <p>Is there anything special with binding to a (ReadOnly)ObservableCollection, that should notify, when its elements changed ( added or removed, to be exact)?</p> <p>Thanks in advance,<br> Frank</p> <p>Edith includes the declaration of the Collection(s):</p> <pre><code>public class MyClass { private ObservableCollection&lt;IServiceItemVMBase&gt; _children; private ReadOnlyObservableCollection&lt;IServiceItemVMBase&gt; _childrenReadOnly; public ViewModelBase(IServiceObjectBase serviceObject, IServiceItemVMBase parent) { _children = new ObservableCollection&lt;IServiceItemVMBase&gt;(); _childrenReadOnly = new ReadOnlyObservableCollection&lt;IServiceItemVMBase&gt;(_children); } public ReadOnlyObservableCollection&lt;IServiceItemVMBase&gt; Children { get { return _childrenReadOnly; } } } </code></pre>
 

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