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As I thought, annotations are saved within the workflow definition as an attached property. Here's what an annotation looks like in the workflow's xaml: <pre><code><Sequence xmlns:derp="http://schemas.microsoft.com/netfx/2010/xaml/activities/presentation" derp:Annotation.AnnotationText="This is an annotation!"> </code></pre> See, just like any other attached property. Except it isn't. Its an attached workflow property, not an attached DependencyProperty. That means it works through the attached property service as well as the <a href="http://msdn.microsoft.com/en-us/library/system.activities.presentation.annotations.annotation.aspx" rel="nofollow">Annotation class</a>. Getting and setting the annotation text on a ModelItem is trivial (and covered below). Its actually not that hard to support annotations. As long as you don't mind your UI looking like crap. Here's a quick and dirty implementation. In the UI, add some controls for holding and editing the annotation text <pre><code><sap:WorkflowViewElement x:Class="AnnotationSupport.MyActivityDesigner" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" xmlns:sap="clr-namespace:System.Activities.Presentation;assembly=System.Activities.Presentation" xmlns:ann="clr-namespace:System.Activities.Presentation.Annotations;assembly=System.Activities.Presentation" xmlns:sapv="clr-namespace:System.Activities.Presentation.View;assembly=System.Activities.Presentation" x:Name="root" MinWidth="100" MinHeight="100"> <Grid Background="red"> <Grid.RowDefinitions> <RowDefinition Height="auto" /> <RowDefinition /> </Grid.RowDefinitions> <Expander IsExpanded="False">  <TextBox Text="{Binding ModelItem.AnnotationText}" /> </Expander> <TextBox Grid.Row="1" Text="{Binding ModelItem.Text}" Margin="10" /> </Grid> </sap:WorkflowViewElement> </code></pre> Any time the Annotation text changes, the ModelItem's PropertyChanged event fires, just like any other property. And if you want to grab it from code, the simplest way is to cast the ModelItem to a <code>dynamic</code>: <pre><code>private void SetAnnotationLol(string newValue) { if(ModelItem != null) ((dynamic)ModelItem).AnnotationText = newValue; } </code></pre> Now, if you want to create a nice UI like the Fx Activities have... well... I'll leave it up to you to create a custom <a href="http://msdn.microsoft.com/en-us/library/ms743737.aspx" rel="nofollow">Adorner</a> to handle display and editing of the annotation. Which actually isn't as hard as it first looks. If you haven't done one yet, here's your opportunity.
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1. POIn custom WorkflowViewElement, how to support WF4.5 Annotations?
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1. COThat's great Will - thanks for taking the time. Looks like I'm going to have to spend more time with my WPF book open (normally I open it, shudder, and and close it again!)
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2. CO@TobyCouchman its not that bad. Coded forms, html and wpf, and wpf is the best one of all. Yea, there's a learning curve, but you have StackOverflow!
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