Legend checked index always 0

[Kuldeep S. D. <kul...@gm...>]

Hello Qwt guys.
i did a little test:

example mutated: cpuplot
changes:
cpuplot.h (added third parameter "int" to slot)
void legendChecked( const QVariant &, bool on, int );

cpuplot.cpp
(added "int" as per header)
connect( legend, SIGNAL( checked( const QVariant &, bool, int ) ),
         SLOT( legendChecked( const QVariant &, bool, int ) ) );

(added the "int" parameter and print it to commandline)
void CpuPlot::legendChecked( const QVariant &itemInfo, bool on, int index )
{
     qDebug() << index;
     QwtPlotItem *plotItem = infoToItem( itemInfo );
     if ( plotItem )
         showCurve( plotItem, on );
}

what ever legend legendLabel i click, it always print "0" instead of    
index that was expected.
(should also be same for clicked())
why?

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