Initial binding of combobox

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C#

WinForms

Hi I have a combobox with a bindingsource as a datasource. Inside the bindingsource, there is a collection of objects (Material object).
My main binding source which is bound to the combobox's selectedvalue property contains a quoteline object. One of the properties of quoteline, is an embedded Material object.
I would therefore want a combobox displaying a list of Material objects and when the user selects a Material from the combobox, the Material property of the Quoteline is updated with the selected object. Everthing works fine, except the initial selected item of the combobox. It just parks on the 1st object in the list. Here is my code. Please help.

Material material;
Material material2;

public Form1()
        {

 
            InitializeComponent();
            prematerial = new Material();
            prematerial.MaterialId = 0;
            prematerial.MaterialDesc = "Pine";
            bindingSource1.Add(prematerial);
            material = new Material();
            material.MaterialId = 1;
            material.MaterialDesc = "Kiaat";
            bindingSource1.Add(material);
            material2 = new Material { MaterialId = 2, MaterialDesc =  
            Den;};
            bindingSource1.Add(material2);
            comboBox1.DataSource = bindingSource1;
            comboBox1.DisplayMember = "MaterialDesc";

            quoteline = new QuoteLine { Material = material2 };
            bsMaster.Add(quoteline);

            comboBox1.DataBindings.Add(new Binding("SelectedValue", bsMaster, "Material", true));
        }