添加项目文件。

Fluent.Ribbon/Fluent.Ribbon/IToggleButton.cs

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+namespace Fluent
+{
+    using System.Windows;
+
+    /// <summary>
+    /// Interface for controls that support <see cref="ToggleButton"/>-Behavior
+    /// </summary>
+    public interface IToggleButton
+    {
+        /// <summary>
+        /// Gets or sets the name of the group that the toggle button belongs to.
+        /// Use the GroupName property to specify a grouping of toggle buttons to
+        /// create a mutually exclusive set of controls. You can use the GroupName
+        /// property when only one selection is possible from a list of available
+        /// options. When this property is set, only one ToggleButton in the specified
+        /// group can be selected at a time.
+        /// </summary>
+        string GroupName { get; set; }
+
+        /// <summary>
+        /// Gets or sets a value indicating whether SplitButton is checked
+        /// </summary>
+        bool? IsChecked { get; set; }
+
+        /// <summary>
+        /// Gets a value indicating whether the ToggleButton is fully loaded
+        /// </summary>
+        bool IsLoaded { get; }
+
+        /// <summary>Gets the logical parent  element of this element. </summary>
+        /// <returns>This element's logical parent.</returns>
+        DependencyObject Parent { get; }
+    }
+}