[news.eclipse.platform.swt] FieldEditor does not write default-value

["arne anka" <arne.anka@xxxxxxxxxxxx>]

in a prefgerences-page i have two FieldEditors. to ease the use i display  
default-values, so the suer has not to type in any values if he's happy  
with default ones.
but the default values are not stored to the prefs -- thus any attempt to  
use those values causes an error.
if i fill in arbitrary values, different from the default, it's stored --  
but thus the ability to present default values seems meaningless to me.
what do i wrong, how do i force the FieldEditors to save even the  
unchanged default?


public class LocalDBPreferencePage extends FieldEditorPreferencePage  
implements IWorkbenchPreferencePage {

    IPreferenceStore ips;

	public LocalDBPreferencePage() {
		super(GRID);
		setPreferenceStore(ips=MyPlugin.getDefault().getPreferenceStore());
		setDescription("Preference page for the local Derby-DB");
	            ips.setDefault("derbydbpath",  
Platform.getLocation().toOSString());
	            ips.setDefault("derbydbname", "NJVDB");
	}
	
	public void createFieldEditors() {
	        Composite fep=getFieldEditorParent();

       	        DirectoryFieldEditor dfe=new  
DirectoryFieldEditor(PreferenceConstants.P_PATH, "&Speicherort der DB:",  
fep);
	        dfe.setPreferenceName("derbydbpath");
	        addField(dfe);

	        StringFieldEditor sfeDBN=new  
StringFieldEditor(PreferenceConstants.P_STRING, "Datenbankname:", fep);
	        sfeDBN.setPreferenceName("derbydbname");
	        addField(sfeDBN);
	}

	public void init(IWorkbench workbench) {}
	
}