OpenMenuFlyoutAction.cs

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using Microsoft.Xaml.Interactivity;
using Windows.UI.Xaml;
using Windows.UI.Xaml.Controls.Primitives;

namespace PhotoSharingApp.Universal.Actions
{
    /// <summary>
    /// Opens the attached menu flyout.
    /// </summary>
    public class OpenMenuFlyoutAction : DependencyObject, IAction
    {
        /// <summary>
        /// Executes the action.
        /// </summary>
        /// <param name="sender">
        /// The <see cref="T:System.Object" /> that is passed to the action by the behavior. Generally this is
        /// <seealso cref="P:Microsoft.Xaml.Interactivity.IBehavior.AssociatedObject" /> or a target object.
        /// </param>
        /// <param name="parameter">The value of this parameter is determined by the caller.</param>
        /// <remarks>
        /// An example of parameter usage is EventTriggerBehavior, which passes the EventArgs as a parameter to its actions.
        /// </remarks>
        /// <returns>
        /// Returns the result of the action.
        /// </returns>
        public object Execute(object sender, object parameter)
        {
            var senderElement = sender as FrameworkElement;
            var flyoutBase = FlyoutBase.GetAttachedFlyout(senderElement);

            flyoutBase.ShowAt(senderElement);

            return null;
        }
    }
}