Bind string value to ComboBox that represent numeric field?

See more:

C#

combobox

data-binding

I have an entity object "Account" that contain fields such that

public class Account
{
    public string Name{get;set;}
    public int Type{get;set;}
}

Account Type is a fixed values such that {"basic","derived","no type",...}
I bind Name field to text box,I want to bind Type to combo box where string values appear as combo box items.
I bind Dictionary to ComboBox such that

Dictionary<string, int> AccountType = new Dictionary<string, int>
	{
	  {"no type", 0},
	  {"basic", 1},
	  {"derived", 2}
	};
combo.DataSource = new BindingSource(AccountType, null);
combo.DisplayMember = "Key";
combo.ValueMember = "Value";

How can I bind to ComboBox where drop down list contain only unique values of strings that represent Int value.