Horizontal container is a "grouping" mechanism to group one or more elements horizontally.
You should set the positional properties only:
lefttopwidth and height are set automatically based on the child elements (total).
You add element by defining the + sign. Example:
#D1+ image { left = 50 top = 10 width = 60 height = 60 file = "center.png" }For the element:
+ hbox { left = 300 top = 50%+310 width = 20 height = 100 #D1 + image { left = 50 top = 10 width = 60 height = 60 file = "center.png" }#D2 + image { left = 40 top = 20 width = 70 height = 70 file = "button_n.png" }}Notice the generated vertical box has:
That's all about vertical containers.