c# - Add item to binded combobox to list -


I have a combo box which is bound to list like this 

  public list & lt; Customer language & gt; Current Customer Customer List {Get (_currentCustomerLanguageList;} set {_currentCustomerLanguageList = value; BsCustomerLanguages.DataSource = Presenter.CustomerLanguageToProxy (value); cbLanguage.DataSource = bsCustomerLanguages.DataSource; cbLanguage.DisplayMember = "LanguageName"; CbLanguage.ValueMember = " ID ";}}   
 I have the + - buttons on the form that allow the addition or removal of items inside the combobox.  
 The problem is: I do not know how the new Cambodia binding source and list to the item without full refresh Of course, when I add, the selected value must be left and no selected Valued Event should be raised.   
 
 
 'bsCustomerLanguages' is a  binding source  in that case if you set the  cbLanguage.DataSource = bsCustomerLanguages ​​ and bsCustomerLanguages ​​add directly to it

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