DataSource for User Control

I am buidling a user control. Currently it consists of a textbox and a button - as a learning experience. This will be used as a basis for a more useful control.

I want to add a DataSource, display member and ValueMember.
Here is my code for the datasource. It will display in the Properties editor, but is disabled and grayed out. What am I missing?

    private object MyDataSource;

    [Browsable(true)]
    [TypeConverter("System.Windows.Forms.Design.DataSourceConverter")]
    [System.ComponentModel.Bindable(true)]
    public object DataSource
    {
        get
        {
            return MyDataSource;
        }
        set
        {
            if (MyDataSource != value)
                MyDataSource = value;
        }
    }