first `expandRowForItem` not animate

    BOOL listIten = [self.treeView isCellForItemExpanded:model] == NO;
    if (listIten) {
        [self.treeView expandRowForItem:model expandChildren:NO withRowAnimation:RATreeViewRowAnimationAutomatic];
    } else {
        [self.treeView collapseRowForItem:model collapseChildren:YES withRowAnimation:RATreeViewRowAnimationAutomatic];
    }