| type | (string) the type of a control, set it to "block". If not specified - the "navItem" type is applied by default. |
| id | (string, number) the id of a control, auto-generated if not set |
| parent | (string) the parent of the block |
| css | (string) adds a custom CSS class to the block |
| items | (array) an array of nested controls |
| title | (string) sets a text label beneath the block |
| direction | (string) defines the layout of controls within the block: "col" or "row"; controls that do not fit in one row/column are automatically placed in the next row/column |
| hidden | (boolean) defines whether a block is hidden |
| disabled | (boolean) defines whether a block is disabled |