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" 'System.ArgumentOutOfRangeException' occurred in PresentationCore.dll " while adding items to Ob

Posted By:      Posted Date: September 24, 2010    Points: 0   Category :WPF
I have custom workflow designer in wpf application.
So there is a toolbox with activities.
I have collection of toolbox items in toolbox:

public ObservableCollection<WorkflowToolbox> Items
            get { return (ObservableCollection<WorkflowToolbox>)GetValue(ItemsProperty); }
            set { SetValue(ItemsProperty, value); }

// Using a DependencyProperty as the backing store for Items.  This enables animation, styling, binding, etc...
 public static readonly System.Windows.DependencyProperty ItemsProperty = System.Windows.DependencyProperty.Register("Items", typeof(ObservableCollection<WorkflowToolbox>), typeof(WorkflowToolboxContainer), new UIPropertyMetadata(new ObservableCollection<WorkflowToolbox>()));

Then every time i close/open that component in UI this collection  is cleared and populated with new items.

WorkflowToolbox toolBox = new WorkflowToolbox { DataContext = assembly };

And after 2 open/reopen i had ArgumentOutOfRangeException with stack trace:
   at System.Windows.Me

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