QAbstractTextDocumentLayout handler problem

I draw a QTextDocument on QGraphicsItem to edit xhtml <div> layer

on a separate QObject i handle all text like QTextControl i connect my timer from blink cursor and the doc

Code:

d = new QTextDocument(this);
_layout = _d->documentLayout(); 
connect ....

by timer event on blink cursor i update only his rect,
now i have trouble to handle QAbstractTextDocumentLayout

cursor blink run , i can edit document , move its , and all other...
only text Highlight by selection from cursor not run...

On line 36 from this code i have a true selecection by text
selectAll(); or word select i send the update request and his not draw :-( why,

note C_cursor ist the original QTextCursor from selection...

Code:

/* child from class TextLayer : public QObject, public QGraphicsItem */
 
void MountTextPrivate::paint_doc(  QPainter * painter ,
                         const QStyleOptionGraphicsItem *option , 
                         QBrush BGpage , 
                         const QRectF fulllayer ,  
                         bool alternate )
{
 
 
	  /* Layer Background draw! */
		painter->save();
		painter->setPen(Qt::NoPen);
		painter->setBrush(BGpage);
		painter->drawRect(fulllayer);
		painter->restore();
	  /* rect from frame root QTextDocument*/
	  QRectF doc_rect = boundingRect();
 
		QColor BackHightlight("#a6ffc7");
					 BackHightlight.setAlpha(140);
 
		QAbstractTextDocumentLayout::PaintContext CTX;    
		CTX.selections;
		 if (doc_rect.isValid()) {
					painter->setClipRect(doc_rect, Qt::IntersectClip);
					CTX.clip = doc_rect;
		 }
		CTX.palette.setColor(QPalette::Highlight,BackHightlight);
		CTX.palette.setColor(QPalette::HighlightedText,Qt::black);
		/* blink cursor from timer event ! */
		if (cursortime) {
		CTX.cursorPosition = cursor_position;
		}
 
	  if (C_cursor.hasSelection()) {
		  QAbstractTextDocumentLayout::Selection Internal_selection;
		  Internal_selection.cursor = C_cursor;
		  CTX.selections.append(Internal_selection);
	  }
    _layout->draw(painter,CTX);
}