DisplayMember ComboBox not showing property on datasource update

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C#

.NET

Ok I've read lots of forums and found a way to update my ComboBox without using a BindingList. My way to do it is:

<code>
comboBox3.DataSource = null;
comboBox3.Items.Clear();
comboBox3.DataBindings.Clear();
RFIDReader reader = space.Readers.Find(z => z.Name == comboBox1.SelectedValue.ToString());

comboBox3.ValueMember = "Id";
comboBox3.DisplayMember = "Id";
comboBox3.DataSource = reader.Antenas;
comboBox3.SelectedIndex = 0;
comboBox3.Refresh();
comboBox3.Update();
</code>

So I have a class RFIDReader which has a collection of antenas, each antena has an Id which is the property I'm trying to show. I'm getting some odd behavior, when I Load the tabPage this list is in, it displays correctly. When I add an Item to the list of antenas, I update my list with that same code and everything's correct, the combo has the Id of the antennas. Then, when I remove an antena from the list, I update the list again with the aforementioned code and sometimes it will display the Ids correctly, others it seems like there's no Displaymember because all I get in the combo is Mynamespace.RFIDReader... not the property itself. Why could this happen? I find this quite odd, the valuemember seems correct because if I try to remove a reader with the selected value it will be removed from the List so the problem seems the displaying only... Thanks a lot