Using portal development mode, simply specify:
- the path
- page type
- and towards the bottom of the properties window in the "Editing buttons" section ensure the "show new", "show edit" and "show delete" buttons are checked.
Since these "show" buttons are only available via the web part and not the repeater control, you are not able to use this in ASPX mode because web parts are designed to be used with Portal Development mode only. You'd have to recreate the similar functionality as the Repeater webpart has for these buttons on your ASPX template.