I added a lot of myComboBox controls to form.
Every combobox shows all its content selected.
Selection is removed only when I tab off from the control.

How to hide selection initially?
There is not HideSelection property in Combobox.

class myComboBox : ComboBox {
internal myComboBox(DataRow dr, DataTable table) {
DisplayMember = "DisplayMember";
ValueMember = "ValueMember";
DataSource = lookup.GetPickList();
DataBindings.Add("SelectedValue", table,
dr["controlsrc"].ToString());
AutoCompleteSource = AutoCompleteSource.ListItems;
AutoCompleteMode = AutoCompleteMode.SuggestAppend;
}}