If you are using .net4 you can add the References System.Xaml and WindowsFormsIntegration to your Winforms project.
This allows you to find the ElementHost in you Toolbox. By using the ElementHost you can use WPF objects in your Winfroms project.
System.Windows.Forms.Integration.ElementHost elementHost1 = new System.Windows.Forms.Integration.ElementHost();
System.Windows.Controls.TextBox textBox = new System.Windows.Controls.TextBox();
textBox.SpellCheck.IsEnabled = true;
elementHost1.Child = textBox;
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