Size of custom qml types

[billy_blaze42]

Hi all,

I'm trying to extend qml by a custom type defined in C++. My type - called SvgItem - is supposed to be able to render a single element of a svg file (by elementId, like QGraphicsSvgItem).
I got it working in-so-far, that the elements are painted in qml. Unfortunately, qml seems to be unable to access size information of my custom type. Therefore, I cannot put my SvgItem in a grid properly or make out its center.

I implemented SvgItem by inheriting QDeclarativeItem and delegating to a QGraphicsSvgItem in painting functions. The QGraphicsSvgItem is held as a member in SvgItem.
I declared the Q_PROPERTYs source and elementId in order to access the svg file and its elements, which apperently works.
However, my SvgItem has no size in qml.

I found a similar implementation in the KDE project: "SvgItem.h":http://lxr.kde.org/source//kde/kde-runtime/plasma/declarativeimports/core/svgitem.h
It makes use of the properties implicitWidth and implicitHeight. I implemented them in my SvgItem, but it was no help.

What is the correct way to go, in order to impart the size information to qml?

Thanks a lot!