TrackerScroller *scroller = [[TrackerScroller alloc] initWithFrame:[oldScroller frame]];
[scroller setControlSize:[oldScroller controlSize]];
- [scroller setFloatValue:[oldScroller floatValue] knobProportion:[oldScroller knobProportion]];
+ [scroller setDoubleValue:[oldScroller floatValue]];
+ [scroller setKnobProportion:[oldScroller knobProportion]];
[scroller setControlTint:[oldScroller controlTint]];
// set the new scroller