Get runtime value of property attribute

I'm trying to get the runtime value of a property defined in a class without any luck so far in C# .NET 4.0. Any guideline about how to do that would be appreciated.

Lets say I have a class named Test33 which has a property named DisplayTwoDecimals on which I applied Browsable(false). Later in the code I will update the value of Browsable to true. I'd like to inspect what the value of Browsable attribute is at runtime.

Here is the Test33 class:

public class Test33
{
    [Browsable(false)]
    public bool DisplayTwoDecimals
    {
            get; set;
    }

    public void ChangeBrowsableAttribute(bool value, string property)
    {
        PropertyDescriptor pDesc = TypeDescriptor.GetProperties(GetType())[property];
        BrowsableAttribute attrib = (BrowsableAttribute)pDesc.Attributes[typeof(BrowsableAttribute)];
        FieldInfo isBrowsable = attrib.GetType().GetField("browsable", BindingFlags.NonPublic | BindingFlags.Instance);
        isBrowsable.SetValue(attrib, value);
    }

    public static bool GetBrowsable(PropertyInfo property)
    {
        var atts = property.GetCustomAttributes(typeof(BrowsableAttribute), true);
        if (atts.Length == 0)
                return true;

        return (atts[0] as BrowsableAttribute).Browsable;
    }
}

Following code fragment shows the value of Browsable attribute at runtime in a rich text box:

public Form1()
{
    InitializeComponent();

    Test33 t = new Test33();
    t.ChangeBrowsableAttribute(true, "DisplayTwoDecimals");

    List<PropertyInfo> pis = t.GetType().GetProperties().ToList();
    richTextBox1.AppendText(Test33.GetBrowsable(pis[0]).ToString() + "\n");
}

Despite the face that I've changed the Browsable attribute to true, the rich text box is showing False.