C# - Custom Control With Nullable Property That Has A Default Value?

I can create a custom control with a default value:

private bool exclue = false;
public bool Exclude { get { return exclue; } set { exclue = value; } }

I can Create the same thing with a nullable property:

private EntityStatuses? status = EntityStatuses.Active;
public EntityStatuses? Status { get { return status; } set { status = value; } }

But how can i then set the property to null in markup when using the custom control?

<MyControls:Control ID="Con" runat="server" Status="?" >