title: Custom activity in WF 4.0: WorkflowItemsPresenter wont show converted array
body: <p>we have an Array which is converted via a Binded Converter:</p>
  
  <pre><code>else if (TTools.IsOfBaseClass(value.GetType(), typeof(System.Activities.Presentation.Model.ModelItemCollection)))
          {
  
                OurBaseClass[] test = (value as ModelItemCollection).GetCurrentValue() as OurBaseClass[];
                List&lt;OurBaseClass&gt; listOfArray = new List&lt;OurBaseClass&gt;();
                foreach (OurBaseClass item in test)
                  {
                       listOfArray.Add(item);
                  }
                  return listOfArray;
  
          }
  </code></pre>
  
  <p>the convertion works well but it is not shown in our dynamically gui</p>
  
  <p>gui code with bindings:</p>
  
  <pre><code>&lt;sap:WorkflowItemsPresenter xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:sap="clr-namespace:System.Activities.Presentation;assembly=System.Activities.Presentation"  Grid.Column="0" Name="MyArray" Items="{Binding Path=ModelItem.MyArray}"  MinWidth="150" Margin="0"&gt;
                  &lt;sap:WorkflowItemsPresenter.SpacerTemplate &gt;
                      &lt;DataTemplate&gt;
                          &lt;TextBlock  Foreground="DarkGray" Margin="30"&gt;..&lt;/TextBlock&gt;
                      &lt;/DataTemplate&gt;
                  &lt;/sap:WorkflowItemsPresenter.SpacerTemplate&gt;
                  &lt;sap:WorkflowItemsPresenter.ItemsPanel&gt;
                      &lt;ItemsPanelTemplate&gt;
                          &lt;StackPanel Orientation="Vertical" HorizontalAlignment="Center" Margin="0"/&gt;
                      &lt;/ItemsPanelTemplate&gt;
                  &lt;/sap:WorkflowItemsPresenter.ItemsPanel&gt;
              &lt;/sap:WorkflowItemsPresenter&gt;
  </code></pre>
  
  <p>Why is the gui not shown as a List??? it works well without converter.
  Thanks</p>