Editing a chart in writer in C++

[AhmetCakir]

I am coding a C++ application where I insert a diagram :

Reference <XMultiServiceFactory> xMultiServiceFactory(xComponent,UNO_QUERY);

Reference <XTextContent> xTextContent(xMultiServiceFactory->createInstance(OUString::createFromAscii("com.sun.star.text.TextEmbeddedObject")),UNO_QUERY);

Reference <XPropertySet> xPropertySet(xTextContent,UNO_QUERY);

xPropertySet->setPropertyValue(OUString::createFromAscii("CLSID"),makeAny(this->msChartClassID));

Reference <XText> xText(xTextDocument->getText(),UNO_QUERY);
Reference <XTextCursor> xTextCursor(xText->createTextCursor(),UNO_QUERY);


xText->insertTextContent(xTextCursor.get(),xTextContent,true);

and by default there are 4 rows and 3 columns !! And I am wondering how I can change it

Thanks