TreeGrid is a UI component add-on for Vaadin 7. It adds the ability to display and edit hierarchical data source in the Grid component (similar to TreeTable's extension to Table). ## Features: - Basic functionality for displaying hierarchical data in Grid - CSS configurable hierarchy indicators - Expand/collapse functionality on mouse click - Programmatically settable hierarchy column - Keyboard navigation (Alt/Option + Arrow keys) - Support for custom renderer on hierarchy column - Support for custom depth calculation logic - Support for custom collapse logic ## Notes: - **This add-on relies on changes in Vaadin Framework 7.7.6** - This add-on is compiled with Java 7