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I have a problem with a WPF control that I'm trying to host in an ElementHost in a WinForms app. The control is a lookless custom control that I originally developed in a separate test project, which was a WPF app. In there it obviously works fine, but in my WinForms app all I get is a blank grey box where the ElementHost is displayed. Here's my C# code for creating, populating, and adding the ElementHost to the parent Control: // This is my WPF control m_TabHostPanel = new TabHostPanel(); m_ElementHost = new ElementHost { Child = m_TabHostPanel, Dock = DockStyle.Top, Height = 34 }; this.Controls.Add( m_ElementHost ); The parent control contains other WinForms controls that are added and removed at runtime, as needed. These are all hosted singly with their Dock set to DockStyle.Fill. Thus, every time I add one I send the ElementHost to the back of the Z-order to make sure it renders correctly: m_ElementHost.SendToBack(); Thus, I know I'm not running into an airspace problem, or anything like that. The one thing I did wonder about is this: in the original project the styles for all my lookless controls were merged into the resource dictionary for the application in App.xaml, like this: <Application x:Class="WpfTestApp.App" xmlns="http://schemas.microsoft.com/winfx/2006/xaml/presentation" xmlns:x="http://schemas.microsoft.com/winfx/2006/xaml" StartupUri="MainWindow.xaml"> <Application.Resources> <ResourceDictionary> <ResourceDictionary.MergedDictionaries> <ResourceDictionary Source="Application/UserInterface/DataTemplates/TabModelDataTemplate.xaml"/> <ResourceDictionary Source="Application/UserInterface/Styles/HoverablePressableButtonStyle.xaml

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