[android-developers] Trouble programmatically setting default value of a Preference

I have a simple CheckBoxPreference "blargh" defined in an XML file. I
want to programatically set its default value with code like this
which does not work

in subclass of PreferenceActivity:

public void onCreate() {
addPreferencesFromResource(R.xml.prefs);
findPreference("blargh").setDefaultValue(true);
}

I would expect with code above that the first time the activity is
displayed, the checkbox preference is checked due to true set as the
default value. This isn't the case, it is unchecked.
(In code above I force default value to true but in reality this is a
computed value).
I made sure to uninstall the app before reinstalling it to ensure
first run conditions.

What I'm doing wrong ? What's the correct way to dynamically set a
default value for a preference loaded from XML ?

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