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copied!<p>I've found something that works. The idea is use the <code>DesignerProperties.GetIsInDesignMode(...)</code> approach combined with <strong>checking for the process name that is running the code</strong>. </p> <p>For my VisualStudio 2010, I see that the process name is "devenv":</p> <p><img src="https://i.stack.imgur.com/DwjMC.png" alt="Visual Studio Process name"></p> <p>Then I found <a href="https://stackoverflow.com/a/2427420/718325">this post</a> which explains that the <code>System.Diagnostics.Process</code> is what we need to get at the process information. Knowing that, I created this helper method:</p> <pre><code>private bool IsVisualStudio2010DesignerRunning() { using (var process = System.Diagnostics.Process.GetCurrentProcess()) { const string visualStudio2010ProcessName = "devenv"; if (process.ProcessName.ToLowerInvariant().Contains(visualStudio2010ProcessName) && DesignerProperties.GetIsInDesignMode(this)) { return true; } else return false; } } </code></pre> <h2>To illustrate that this is working, here is an example of its application</h2> <p>Its in a custom control that I wrote called SunkenBorder. This control has a behavior where it transitions to a certain VisualState at its first opportunity, so that this state is its initial state that the user sees. This code executes in the <code>OnApplyTemplate()</code> override. Expression Blend 4 is able to handle and display this at runtime. Visual Studio 2010's designer on the other hand, crashes entirely, as it is unable to execute the <code>Storyboard</code> that is initiated by a call to <code>VisualStateManager.GoToState(...)</code>. </p> <p>To better illustrate that this is working, I'm setting the background property of the control to blue in the <code>OnApplyTemplate()</code> code that targets the VS 2010 designer (see screenshots).</p> <pre><code> /// Non-static constructor public SunkenBorder() { // Avoid Visual Studio 2010 designer errors if (IsVisualStudio2010DesignerRunning()) return; // Expression Blend 4's designer displays previews of animations // that these event handlers initiate! Initialized += new EventHandler(SunkenBorder_Initialized); Loaded += new RoutedEventHandler(SunkenBorder_Loaded); Unloaded += new RoutedEventHandler(SunkenBorder_Unloaded); IsVisibleChanged += new DependencyPropertyChangedEventHandler(SunkenBorder_IsVisibleChanged); } // ... /// Used to set the initial VSM state (its the first opportunity). public override void OnApplyTemplate() { base.OnApplyTemplate(); if (IsVisualStudio2010DesignerRunning()) { // set a property just to illustrate that this targets only Visual Studio 2010: this.Background = Brushes.Blue; // return before doing VisualState change so Visual Studio's designer won't crash return; } // Blend 4 executes this at design-time just fine VisualStateManager.GoToState(this, "InitialState", false); // ... } </code></pre> <p>Here's how Expression Blend 4's preview looks (notice the background of the SunkenBorder controls are not blue)...</p> <p><img src="https://i.stack.imgur.com/AbLYW.png" alt="Blend 4 designer preview"></p> <p>... and here's what Visual Studio's designer shows me. Now its designer is not crashed and the SunkenBorder controls' backgrounds are all blue...</p> <p><img src="https://i.stack.imgur.com/DU058.png" alt="Visual Studio 2010 designer preview"></p> <p>... and finally, here's the result at runtime (again the SunkenBorder controls' backgrounds are not blue):</p> <p><img src="https://i.stack.imgur.com/tpJAD.png" alt="enter image description here"></p>

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