Von den Release Notes http://www.smartclient.com/smartgwt/release_notes.html#2_1:
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GWT 2.0.3 compatible
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New Graphite theme
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ListGrid enhancements
- Record RollOver controls
- RollUnder Canvas support
- Background components
- Support for arbitrary widgets in cells
- Ability to display row numbers
- setMaxExpandedRecords(..) to control max. number of simultaneous expanded records
- ListGridField.setCanDragResize(), setCanReorder(), setAutoFreeze(), setShouldPrint() API’s
- Checkbox selection with grouping
- MultiColumn sort enhancements
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TreeGrid enhancements
- Support for Checkbox tree with Cascade selection
- Support for tri-state checkboxes (selected, unselected, partial)
- Performance enhancements
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ToolStrip enhancements
- Significant improvement in appearance
- Added ToolStripButton and ToolStripMenuButton classes
- Vertical ToolStrips
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Print support enhancements
- ability to control which components display in print view
- print styling on a per-component basis
- support print window customizations
- API for the number of records displayed in print view (can be different from UI view)
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Browser Plugins as widgets
- Flashlet widget
- Applet widget
- ActiveXControl widget
- SVG widget
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Other Widget enhancements
- Window : support for footer controls
- Calendar : control dragability of events
- New IMenuButton & IPickTreeItem classes with improved appearance
- AdvancedCriteria enhancements and support for programmatic construction
- SectionStack drag reordering support
- FilterBuilder support for working with very large number of fields
- Convenience FormItem.setRequiredMessage(..) API
- TileGrids now automatically relayout if a tile resizes
- Added support for grouping for formula and summary fields
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Performance enhancements
- Snappier TreeGrid expand / collapse
- Faster Canvas resize
- Faster Tab close (deferred destroy)
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Logging of warnings and error to the GWT Developer Console in addition to the Smart GWT Dev. Console.
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Improved exception handling and reporting.
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i18n enhancements
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Showcase enhancements and several new samples under the „New Samples“ side nav
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27 additional enhancements and bug fixes that were logged in tracker