Access MS Accesability Properties (name, helptext) of ListBox item(child) in General

Is there a was to access the accessible Object of childs (items) of ListBoxes to change their MSAA propperties (name, helptext)?

It is a WinForm Application.

 And is there a general good way (how to)  to implement MSAA in an WinForms application for Coded Ui Testing?