If it is set to false, or if it isn't set at all, then the tree item's children are not displayed. A tree item's children are specified using the treechildren tag, which is placed within the parent treeitem tag. The treechildren tag contains tree items that represent the children of the parent node. The tree's selection is reflected into the content model. Tree items that are selected have an attribute called selected set to true.
Tree rows that are selected have an attribute called selectedrow set.
Tree cells that are selected have an attribute called selectedcell that is set to true. CSS can be applied using attribute selector rules, thus enabling the tree designer to control the look of the tree's selection. A select handler can be attached to the tree, and this handler will be invoked whenever the tree's selection changes. The tree widget also supports hover feedback on items and cells. This hover feedback is also reflected into the content model.