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I'm making Windows Phone 7.1 app with Visual Studio Express 2012 for Windows Phone. I added this namespace to MainPage.xaml: xmlns:myNameSpace="clr-namespace:MyApp" And this: <Grid.Resources> <myNameSpace:MyClass x:Key="referenceToMyClass" /> </Grid.Resources> And used like this in same file: <ListBox Name="MyListBox" Height="{Binding ElementName=ContentPanel, Path=Height}" Width="{Binding ElementName=ContentPanel, Path=Width}" ItemsSource="{StaticResource referenceToMyClass}" DisplayMemberPath="MyAttribute" /> MyClass looks like this: namespace MyApp { class MyClass : ObservableCollection<AnotherClass> { public MyClass() { Class temp = new AnotherClass("Example attribute"); Add(temp); } public void AddAnotherClass(AnotherClass anotherClass) { Add(anotherClass); } } } So when I try to Debug it on my cellphone I get the following error: A first chance exception of type 'System.Windows.Markup.XamlParseException' occurred in System.Windows.dll Additional information: No matching constructor found on type 'MyApp.MyClass'.

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