I have a class that look like this:

public class BasePadWI
{
    public WorkItem WorkItemReference { get; set; }
    .... Other stuff ......
}

I then have a dictionary that is defined like this:

public Dictionary<BasePadWI, Canvas> Pad { get; set; }

I would then like to make a call like this:

List<WorkItem> workItems = Pad.Keys.ToList();

(Note: WorkItem is a sealed class, so I cannot inherit.)

Is there some trickery that I could do in the class to make it look like a WorkItem?

I have done this in the mean time:

List<WorkItem> workItems = Pad.Keys.ToList().ConvertAll(x=>x.WorkItem);