#WPF#WPF 带下拉菜单的按钮

<Button x:Name="menu"  HorizontalAlignment="Right" Height="24" VerticalAlignment="Top" Width="40" Margin="0,1,79.8,0" Click="menu_Click" Content="Hello"/>
        <Popup x:Name="menuPop1" StaysOpen="False" Margin="0" PlacementTarget="{Binding ElementName=menu}" AllowsTransparency="True">
            <StackPanel Margin="0">
                <Button Content="设置" Click="menu1_Click"  Width="40"/>
                <Button Content="关于" Click="menu2_Click"  Width="40"/>
                <Button Content="退出" Click="menu3_Click" Width="40" />
            </StackPanel>
        </Popup>

后台代码 

private void menu_Click(object sender, RoutedEventArgs e)
        {
            menuPop1.IsOpen = true;
        }
        private void menu1_Click(object sender, RoutedEventArgs e)
        {
            menuPop1.IsOpen = true;
        }
        private void menu2_Click(object sender, RoutedEventArgs e)
        {
            menuPop1.IsOpen = true;
        }

        private void menu3_Click(object sender, RoutedEventArgs e)
        {
            menuPop1.IsOpen = true;
        }

效果

使能处理

private void menu_Click(object sender, RoutedEventArgs e)
        {
           menuPop1.IsOpen = true;
           menu.IsEnabled = false;
        }



 private void MainWindow_OnLostMouseCapture(object sender, MouseEventArgs e)
        {
            menu.IsEnabled = true;
        }

xaml中添加

LostMouseCapture="MainWindow_OnLostMouseCapture"