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    <p>The following code demonstrates having two text boxes in a StackPanel, setting focus to the top text box will open the Popup. At which point, if you then move Focus to the text box contained in the Popup it will remain open. If you move focus to another element, in this instance the second text box in the StackPanel, the Popup will close. As you unable to focus the Popup itself I am actually binding to the IsFocused property of the text box in the Popup.</p> <pre><code>&lt;StackPanel&gt; &lt;TextBox x:Name="text" Text="This is a text box" /&gt; &lt;TextBox Text="Another Text Box" /&gt; &lt;Popup PlacementTarget="{Binding ElementName=text}"&gt; &lt;Popup.Style&gt; &lt;Style TargetType="{x:Type Popup}"&gt; &lt;Style.Triggers&gt; &lt;DataTrigger Binding="{Binding ElementName=text, Path=IsFocused}" Value="True"&gt; &lt;Setter Property="IsOpen" Value="True" /&gt; &lt;/DataTrigger&gt; &lt;DataTrigger Binding="{Binding ElementName=popupText, Path=IsFocused}" Value="True"&gt; &lt;Setter Property="IsOpen" Value="True" /&gt; &lt;/DataTrigger&gt; &lt;/Style.Triggers&gt; &lt;/Style&gt; &lt;/Popup.Style&gt; &lt;TextBox x:Name="popupText" Text="HELLO WORLD" /&gt; &lt;/Popup&gt; &lt;/StackPanel&gt; </code></pre> <p>To achieve the same thing in C# you don't have to use the ElementName bindings as you already have the elements right at hand. I almost always use XAML to define my elements so I'm sure you could tidy this a bit.</p> <pre><code>var text1 = new TextBox { Name = "text", Text = "This is a text box" }; var text2 = new TextBox { Text = "Another Text Box" }; var popupText = new TextBox { Name = "popupText", Text = "HELLO WORLD" }; var popup = new Popup { Child = popupText, PlacementTarget = text1 }; var stackPanel = new StackPanel(); stackPanel.Children.Add(text1); stackPanel.Children.Add(text2); stackPanel.Children.Add(popup); var popupStyle = new Style(typeof (Popup)); var textIsFocusedTrigger = new DataTrigger { Binding = new Binding {Source = text1, Path = new PropertyPath("IsFocused")}, Value = true }; textIsFocusedTrigger.Setters.Add(new Setter(Popup.IsOpenProperty, true)); var popupTextIsFocusedTrigger = new DataTrigger { Binding = new Binding {Source = popupText, Path = new PropertyPath("IsFocused")}, Value = true }; popupTextIsFocusedTrigger.Setters.Add(new Setter(Popup.IsOpenProperty, true)); popupStyle.Triggers.Add(textIsFocusedTrigger); popupStyle.Triggers.Add(popupTextIsFocusedTrigger); popup.Style = popupStyle; </code></pre> <p>I hope this helps!</p>
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    1. USDavid Padbury
    1. USDavid Padbury
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    1. COThis seems to be very close to what I'm wanting to do. I ran your code in a test application and the behavior is very similar. I have written the C# to do what your xaml is doing, but something is still off. Since I am not using XAML, I'm thinking I'm having trouble with binding to ElementName. Do have I have to just set the Name property or do register name. Below you will see what I have so far, let me know if you can see what might be wrong. Thanks a lot.
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    2. COI've just edited my answer to provide a C# version of what I was doing in XAML, hopefully this is what you need. Out of interest, why are you using C# over XAML to create your elements?
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