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When \1 is paired with another container such as \l \2, it is
necessary to make a two-way binding between the
\l {Container::}{currentIndex} property
of each control. To do this without breaking bindings, avoid setting
\c currentIndex directly, and instead use
\l {Container::}{setCurrentIndex()}, for example.
See \l {Managing the Current Index} for more information.
To perform an action when \c currentIndex changes, use the
\c onCurrentIndexChanged
\l {Property Change Signal Handlers}{property change signal handler}:
\snippet qtquickcontrols-container-oncurrentindexchanged.qml 1
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