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Custom Eclipse PreferencePage - "Apply" and "OK" greyed-out.

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I am a newcomer to Eclipse PreferencePages and am currently creating a new FieldEditorPreferencePage for my project. However, having FileFieldEditors() or DirectoryFieldEditors() greys-out the "Apply" and "OK" buttons in my custom preference page. On the other hand, the other FieldEditors (Boolean- and Combo-) do not disable the "Apply" and "OK" buttons.

Furthermore, changing everything to Xtext's LanguageRootPreferencePage seems to work as well (though I'd prefer not to use it as I want the custom preference page to show up in it's own tab).

For example:

The code above (partially) worked for FileFieldEditors. However, for some reason I need to click FileFieldEditor field and check and uncheck the checkbox directly above the FileFieldEditor for each FileFieldEditor in the preference page before the "Apply" and "OK" buttons are available again.

Furthermore, I have also implemented a IPropertyChangeListener which deactivates certain fields when certain checkboxes are unchecked which means this "check and uncheck" workaround would not work for me. I have also tried setting the default focus to one of my checkboxes but that didn't work

Is there anyway to fix this? I followed the tutorial from Eclipse Article-Field-Editors but it doesn't seem to work for me. Reading online says it can be due to negative IntegerField (which I don't have) or that I'm trying to change the default settings (which I don't have either).

I am using Eclipse Mars 4.5.0.
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