Question

I’m just curious if anybody has an idea on how to do the dropdown like button on the windows 7 explorer tab using WPF (See Screeshot below).

Answer 1

I use this class, and it looks great:
http://andyonwpf.blogspot.com/2006/10/dropdownbuttons-in-wpf.html

I will post here so it’s cleaner to read:

/// <summary>
/// Andy On WPF: DropDownButtons in WPF
/// http://andyonwpf.blogspot.com/2006/10/dropdownbuttons-in-wpf.html
/// </summary>
public class DropDownButton : ToggleButton
{
    #region Members

    public enum Placement { Bottom, Right }

    #endregion

    #region Properties

    #region DropDownPlacement

    /// <summary>
    /// DropDown placement.
    /// </summary>
    public Placement DropDownPlacement
    {
        get { return (Placement)GetValue(DropDownPlacementProperty); }
        set { SetValue(DropDownPlacementProperty, value); }
    }

    /// <summary>
    /// DropDown placement (Dependency Property).
    /// </summary>
    public static readonly DependencyProperty DropDownPlacementProperty =
        DependencyProperty.Register("DropDownPlacement", typeof(Placement),
        typeof(DropDownButton), new UIPropertyMetadata(null));

    #endregion

    #region DropDown

    /// <summary>
    /// DropDown property.
    /// </summary>
    public ContextMenu DropDown
    {
        get { return (ContextMenu)GetValue(DropDownProperty); }
        set { SetValue(DropDownProperty, value); }
    }

    /// <summary>
    /// DropDown property (Dependency property).
    /// </summary>
    public static readonly DependencyProperty DropDownProperty =
        DependencyProperty.Register("DropDown", typeof(ContextMenu),
        typeof(DropDownButton), new PropertyMetadata(null, OnDropDownChanged));

    #endregion

    #endregion

    #region Events

    private static void OnDropDownChanged(DependencyObject sender,
        DependencyPropertyChangedEventArgs e)
    {
        ((DropDownButton)sender).OnDropDownChanged(e);
    }

    void OnDropDownChanged(DependencyPropertyChangedEventArgs e)
    {
        if (DropDown != null)
        {
            DropDown.PlacementTarget = this;

            switch (DropDownPlacement)
            {
                default:
                case Placement.Bottom:
                    DropDown.Placement = PlacementMode.Bottom;
                    break;
                case Placement.Right:
                    DropDown.Placement = PlacementMode.Right;
                    break;
            }

            this.Checked +=
                new RoutedEventHandler((a, b) => { DropDown.IsOpen = true; });
            this.Unchecked +=
                new RoutedEventHandler((a, b) => { DropDown.IsOpen = false; });
            DropDown.Closed +=
                new RoutedEventHandler((a, b) => { this.IsChecked = false; });
        }
    }

    #endregion
}