I've added the following code before return label; inside parseLabel:

            if (xml.@autosize.length() > 0 && xml.@autosize != "false")
                label.autoSize = TextFieldAutoSize.LEFT;

And added:

                        if (line.@autosize.length() > 0 && line.@autosize != "false") {
                            UILabel(child).autoSize = TextFieldAutoSize.LEFT;
                        }

After:

                        if (childAttributes.fillH || line.@height.length()>0) {
                            UILabel(child).fixwidth = childAttributes.widthH;
                        }

Inside layout.

The reason of it? well, because I wanted to add a label inside a UIScrollVertical component, with a fixed width, but enabling auto sizing, that way the textfield would automatically increase its height, and vertical alignment would work as expected.

Good idea. It will be in the next update.