I just make a my custom style. In my QStyle, I fillrec itemviewrow on drawPrimitive function. Oh, yes I use this style just for my QTreeView..

Qt Code: 
  1. model=new MyModel();
  2. ui->treeView->setModel(model);
  3. ui->treeView->setStyle(new TreeStyle());
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In MyModel I tried set backgroud color for a row with Qt::BackgroundColorRole. But I don't understand why not work. If I remove setStyle from my treeView, Qt::BackgroundColorRole will work..

Qt Code: 
  1. //TReeStyle COde
  2. void TreeStyle::drawPrimitive(PrimitiveElement element, const QStyleOption* option,
  3. 							  QPainter* painter, const QWidget* widget) const
  4. {
  5. 	if (element == PE_PanelItemViewRow || element == PE_PanelItemViewItem)
  6. 	{
  7. 		painter->fillRect(option->rect, option->palette.highlight());
  8. 	}
  9. 	.......................
  10. 	.......................
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Qt Code: 
  1. //MyModel Code
  2. if (role == Qt::BackgroundColorRole)
  3. {
  4. 	.......................
  5. 	.......................
  6. 	return qVariantFromValue(QColor(255, 186, 186));
  7.  
  8. }
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This is normal ? I can't use booth QStyle and Model for QTreeView ?