New Post: Dynamic properties in propertygrid

The sample PropertyGridAttributes could be a start. It contains a class of type IItemsSource. You can see the class in the file :
"Xceed.Wpf.Toolkit.LiveExplorer\Samples\PropertyGrid\Views\PropertyGridAttributesView.xaml.cs".

It let you set an initial ItemsSource for a custom objects. Issue https://wpftoolkit.codeplex.com/workitem/20072 has been created to make sure the ItemsSource can be dynamic.