It seems that my custom tooltip gets used when doing ToolTip {} inside a control, but not when using the attached ToolTip properties. I guess it's just not implemented yet, regardless what the docs suggest? Has anyone successfully styled the attached ToolTip?

I've decided to report this issue as a bug here.
Was you able to reproduce the issue ?

@milan Hi,
You can do it using a delegate and a ToolTip component:

import QtQuick.Controls 2.2 as QC2 ... TableViewColumn { id: titleColumn title: "Title" role: "title" movable: false resizable: false width: tableView.viewport.width - authorColumn.width delegate: QC2.ItemDelegate{ id: lb hoverEnabled: true text: model.title width: parent.width QC2.ToolTip { delay: 250 parent: lb visible: lb.hovered text: "Tooltip text" //put styleData.tooltip here } } }

This code is extracted from the TableView example which I have modified to add the ToolTip.

I guess if there had been concern of a leak, that was apparently a false positive of a unit test. (I'm not sure about this detail).
This has been resolved, as of today. Here is a summary:

This bug originally appeared in Qt 5.0, was reported in Qt 5.3.0 (QTBUG-39147), and fixed for Qt 5.9.2 (on 7-19-2017). The removal of Qt_WS_* macros (replaced with Q_OS_* macros), and incomplete porting of the widgets/kerna/qtooltip.cpp module, caused the QTipLabel to be instantiated with the client widget as its parent widget. That had been a known problem on Windows which directly caused this dysfunction (Showing a tooltip raises the whole window).

See "Patch Set 6" in this Qt code review page, and it's associated "gitweb" link, and the original bug report:

https://codereview.qt-project.org/#/c/177376/ https://bugreports.qt.io/browse/QTBUG-39147

Just a guess here: did you try using a model (QStandardItemModel) to store the values and use Qt::ToolTipRole to store the tooltip you want to show and them use QVBarModelMapper to plot it?

Hi, this ToolTip bug has been fixed in Qt 5.7.1, which should be released very soon.