# Shift + mouse wheel does not change brush size
**URL:** https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539
**Category:** Development
**Tags:** segmentation
**Created:** [September 23, 2019, 8:52pm UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539 "2019-09-23T20:52:47Z")
**Posts on this page:** 6
**Page:** 1
### Author:  [@Ash\_Alarfaj](https://discourse.slicer.org/u/Ash_Alarfaj)
#### Post date: [September 23, 2019, 8:52pm UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539/1 "2019-09-23T20:52:47Z")
Problem report for Slicer 4.10.2 macosx-amd64: [please describe expected (( if I press shift + mouse up/down the brush size change ))and actual behavior ((this shortcut did not work))]
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 23, 2019, 9:02pm UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539/2 "2019-09-23T21:02:44Z")
You need to interact in a view first to bring that view into focus. For example, you can right-click in a view.
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### Author:  [@Ash\_Alarfaj](https://discourse.slicer.org/u/Ash_Alarfaj)
#### Post date: [September 25, 2019, 9:33am UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539/3 "2019-09-25T09:33:53Z")
Hi Andras
thank you for replay, its doesn’t work even ctr+mouse weels for zooming. I’ve worked for a long time on 3Dslicer and this is a new laptop MacBook pro. The programme had worked nicely with MacBook air and PC but I don’t know why not working properly with MacBook pro≥
regards
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### Author:  [@Ash\_Alarfaj](https://discourse.slicer.org/u/Ash_Alarfaj)
#### Post date: [September 25, 2019, 12:50pm UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539/4 "2019-09-25T12:50:22Z")
Hi Andras
I think there is a bug with this version because I’ve tried in my older mac the older version and it is worked properly with shift or ctrl +mouse wheel.
regards
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### Author:  [@jamesobutler](https://discourse.slicer.org/u/jamesobutler)
#### Post date: [September 25, 2019, 10:44pm UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539/5 "2019-09-25T22:44:18Z")
I think this is [https://issues.slicer.org/view.php?id=4661](https://issues.slicer.org/view.php?id=4661) which is still listed as an open issue.
Previously reported by @Ash_Alarfaj back in November 2018 [Brush size control by key](https://discourse.slicer.org/t/brush-size-control-by-key/4899)
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### Author:  [@lassoan](https://discourse.slicer.org/u/lassoan)
#### Post date: [September 26, 2019, 12:49am UTC](https://discourse.slicer.org/t/shift-mouse-wheel-does-not-change-brush-size/8539/6 "2019-09-26T00:49:09Z")
It would be nice if someone who uses a Mac could investigate why VTK does not emit mouse wheel events on MacOSX (there is nothing MacOSX-specific behavior specified at Slicer level - see [here](https://github.com/Slicer/Slicer/blob/e7d30cb5e2e0a816e98ea8d3695bd2122cbbe530/Modules/Loadable/Segmentations/EditorEffects/qSlicerSegmentEditorPaintEffect.cxx#L1099-L1120)).
Until the behavior is changed, workarounds are available. For example: Use Ctrl +/- keyboard shortcut for approximate brush sizing and use right-click-and-drag to fine-tune physical brush size (brush size is defined in view size by default, therefore zooming in/out the view results in changing in physical brush size change).