With regard to Alex's answer, I think you should focus on the X-size, Y-size property of the WORDBOX and WORDWRAPBOX. Ask yourself, if you don't explicitly define a X-size Y-size value, what is the value of this property.
With regards to your form design, two alternative suggestions.
You have gone the approach of one HBox with two VBox as children. I normally go the other way round, one Vbox with 6 Hbox as children. Each HBox then contains the label and matching value. Your question will then be, how do you get the columns to align. Control-select the 6 label fields and in one go set their X-size property to a value e.g. 2cm, or width("longest label"), or max(width("field1"),width("field2")...)
I have also seen Table object been used in similar circumstances. Delete the body element, clear the border/rule properties, leaving just a header with 2 column and 6 rows.
Reuben