[news.eclipse.platform.rcp] Eclispe NewBie question - Preferences and Wo

["frank Buloup" <buloup@xxxxxxxxxxxxxxxx>]

Hello,

I 've added preference page in my application using plugin.xml extensions 
template.
Then, in a new package, Eclipse created 3 classes (Template preferences page 
extending
FieldEditorPreferencePage, a preference constants class and a preference 
initializer class).

The template preferences page uses a PreferenceClass which doesn't already 
exists...
I suppose this class has to initialize the preference store, in the 
preference template class
constructor, unsing the plugin instance of the product :

"setPreferenceStore(PreferenceClass.getDefault().getPreferenceStore());"

I've tried to extend the AbstractUIPlugin (I've read in differents articles 
from eclipse.org) to catch the
plugin instance when it is created, but without succes (when to catch this 
single instance during startup of eclispe
core runtime ?). Then I've found the existance of  the WorkBenchPlugin class 
which holds this static instance,
I used it, discarding PreferenceClass , but Eclispe tells me that the use of 
this class is discouraged.

Why ? How is it possible to store the plugin instance at startup ?

Thanks a lot for your help,
frank