Cant get user control collection property to show up in designer

Greetings,
 I'm trying to create an ASP.NET user control that will expose a collection of objects as a property. As a proof of concept, I'm simply trying to implement a test control that contains an array of strings, and I'm attempting to enable design-time editing of the property. No matter what I seem to do, my test property doesn't show up in the designer window. Below is a code snippet...
 

/* using directives omitted for brevity */

[ParseChildren(true)]
[PersistChildren(false)]
public partial class Controls_TabView : System.Web.UI.UserControl
{
private string[] strings_ = new string[20];

protected void Page_Load(object sender, EventArgs e)
...