Problem z CodeEditor'em

Witam,

Mam mały problem otóż

private void setupEditor() 
    { 
        QFont font = new QFont(); 
        font.setFamily("Courier"); 
        font.setFixedPitch(true); 
        font.setPointSize(10); 

        textEdit = new QTextEdit(); 
        textEdit.setLineWrapMode(QTextEdit.LineWrapMode.NoWrap); 
        textEdit.setFont(font); 

        new Highlighter(textEdit.document()); 
        new CodeEditor(textEdit.document()); 

    } 
    public class CodeEditor extends QPlainTextEdit 
    { 
        public CodeEditor(QTextDocument textDocument)

dlaczego mi nie chce dodac CodeEditor do textEdit ? Highlighter dziala a to nie