Autocomplete popup is not coming in TextFieldWithAutoCompletion

Hi 

I have a TextFieldWithAutoCompletion inflated on JPanel. And I have a collection of variants applied to TextFieldWithAutoCompletion,

TextFieldWithAutoCompletion<String> completion = TextFieldWithAutoCompletion.create(mProject, QuerySuggestionService.getBasicQueryCommandsAsList(), true, "");
completion.setVisible(true);

TextFieldWithAutoCompletionListProvider<String> provider = new TextFieldWithAutoCompletionListProvider<String>(QuerySuggestionService.getBasicQueryCommandsAsList()) {
    @NotNull
    @Override
    protected String getLookupString(@NotNull String s) {
        Logger.d(getClass().getSimpleName(), s);
        completion.setCaretPosition(completion.getText().length());
        return s;
    }
};

completion.installProvider(provider);

But there is no auto pop-up is coming when I started typing on this completion component.  But getLookupString will trigger each time while typing and whatever the letter I typed It fires the first element in that collection.

I am a noob on this. I didn't find any tutorial or example for this. 

Thanks for your time