ScriptControlDescriptor.AddProperty & Read-Only Properties

Question

I'm creating an ASP.NET Server Control with an associated client-side API.

In my GetScriptDescriptors() method I'm associating a property called "rows"...

descriptor.AddProperty("rows", this.IntRows);

In my client-side API I want my "rows" property to be read-only...

MyControl = function(element)
{
    MyControl.initializeBase(this, [element]);
    this._rows;
}

MyControl.prototype =
{
    initialize: function()
    {
        MyControl.callBaseMethod(this, 'initialize');
    },

    get_rows: function()
    {
        return this._rows;
    },

    dispose: function()
    {
        MyControl.callBaseMethod(this, 'dispose');
    }
}

However this causes the following error...

Error: Sys.InvalidOperationException: 'rows' is not a writable property.

The following setter seems to be required in order for the $create statement to assign "rows" it's initial value:

set_rows: function(value)
{
    this._rows = value;
},

How can I make the "rows" property read-only in the client-side API if the setter is required to assign the value from the AddProperty call?