How to bind a keyboard shortcut to an action item

using Caliburn.Micro;
using System.ComponentModel.Composition;
using VisualComponents.UX.Shared;

namespace Plugin.Demo
{
    [Export(typeof(IDockableScreen))]
    public class DemoViewModel : DockableScreen
    {  
        public DemoViewModel()
        {
            PanelId = "VCDemo";
            DisplayName = "Demo";
            PaneLocation = DesiredPaneLocation.DockedRight;                                                     
        }
    }

    [Export(typeof(IActionItem))]
    [PartCreationPolicy(CreationPolicy.Shared)]
    public class DisplayPanel : ActionItem
    {
        IDockAwareWindowManager dockManager;
        public DisplayPanel() : base("VcDisplayPanel")
        {
            execute = Execute;

            // Use the AttachTo property to bind keyboard Control + T to
            // this action item Execute command
            AttachTo = "[Shortcut Control + T] = [Action Execute];[Event Click] = [Action Execute]";

            dockManager = IoC.Get<IDockAwareWindowManager>();
        }
        public override void Execute()
        {
            foreach (IDockableScreen screen in dockManager.DockPanels)
            {              
                if (screen.PanelId == "VCDemo")
                {
                    if (screen.IsVisible)
                    {
                        dockManager.SetScreenVisibility(screen, false);                      
                    }
                    else
                    {
                        dockManager.SetScreenVisibility(screen, true);
                    }                       
                }
            }
        }
    }
}