open: boolean;
active: boolean;
selected?: boolean;
+ indeterminate?: boolean;
flatTree?: boolean;
status: TreeItemStatus;
items?: Array<TreeItem<T>>;
{showSelection(it) && !useRadioButtons &&
<Checkbox
checked={it.selected}
+ indeterminate={!it.selected && it.indeterminate}
className={classes.checkbox}
color="primary"
onClick={this.handleCheckboxChange(it)} />}