No colourisation with Qt

I am setting CPP lexer to Scintilla but there is no colourisation. Tried in 
Windows and Ubuntu. Result is the same. What am I doing wrong?

Code reports that lexer is set. Tried setting text after setting lexer - 
not working too.

MainWindow::MainWindow(QWidget *parent)
    : QMainWindow(parent)
    , ui(new Ui::MainWindow)
{
    ui->setupUi(this);

    scintilla = new ScintillaEdit(this);

    scintilla->setText("#include \"mainwindow.h\"\r\n\
\r\n\
#include <QApplication>\r\n\
\r\n\
int main(int argc, char *argv[])\r\n\
{\r\n\
    QApplication a(argc, argv);\r\n\
    MainWindow w;\r\n\
    w.show();\r\n\
    return a.exec();\r\n\
}\r\n\
\r\n\
");
#if _WIN32
    typedef void *(__stdcall *CreateLexerFn)(const char *name);
    typedef int (__stdcall *GetLexerCountFn)();
    typedef void (__stdcall *GetLexerNameFn)(unsigned int index, char 
*name, int buflength);
#else
    typedef void *(*CreateLexerFn)(const char *name);
    typedef int (*GetLexerCountFn)();
    typedef void (*GetLexerNameFn)(unsigned int index, char *name, int 
buflength);
#endif
    QFunctionPointer fn = QLibrary::resolve("lexilla", "GetLexerCount");
    int lexCount = ((GetLexerCountFn)fn)();
    qDebug() << "Lexer count =" << lexCount;
    if (lexCount > 0) {
        fn = QLibrary::resolve("lexilla", "GetLexerName");
        for (int i = 0; i < lexCount; i++) {
            char name[100] = "";
            ((GetLexerNameFn)fn)(i, name, sizeof(name));
            qDebug() << name;
        }

        fn = QLibrary::resolve("lexilla", "CreateLexer");
        void *lexCpp = ((CreateLexerFn)fn)("cpp");
        if (lexCpp != NULL) {
            qDebug() << "cpp lexer created.";
            sptr_t old_lexer = scintilla->lexer();
            scintilla->setILexer((sptr_t)(void *)lexCpp);

            sptr_t new_lexer = scintilla->lexer();
            if (new_lexer == old_lexer) {
                qDebug() << "Lexer is not set!";
            }
            else {
                qDebug() << scintilla->lexerLanguage() << "lexer set!";
            }
        }
        else {
            qDebug() << "Lexer is NULL!";
        }
    }

    setCentralWidget(scintilla);

    scintilla->colourise(0, -1);
}

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