Ok, i got the problem. MousePress event does not set the focus on ChartItem or it is setting focus on some sub items, i dont know. Setting focus manually after mouse press event solves the issue.

Qt Code:
  1. void Chart::mousePressEvent(QGraphicsSceneMouseEvent *me)
  2. {
  3. qDebug("mousePressEvent");
  4. QChart::mousePressEvent(me);
  5. setFocus();
  6. }
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