The following built-in template variables can be bound to inside the column templates:
- `[[index]]`: Number representing the row index
- `[[item]]` and it's sub-properties: Data object (provided by a data provider / items array)
- `{{selected}}`: True if the item is selected (can be two-way bound)
- `{{detailsOpened}}`: True if the item has row details opened (can be two-way bound)
- `{{expanded}}`: True if the item has tree sublevel expanded (can be two-way bound)
- `[[level]]`: Number of the tree sublevel of the item, first level-items have 0