Disabling rows in ListPreference
<p>I am creating a settings menu for a free version of my app. I have a <code>ListPreference</code> displaying many different options. However, only some of these options are to be made available in the free version (I would like all options to be visible - but disabled, so the user knows what they are missing!).</p>

<p>I'm struggling to disable certain rows of my <code>ListPreference</code>. Does anybody know how this can be achieved?</p>
