layout.Popup Class
Class handling popup layout defined by setting layout.type to "popup". The popup layout model does not render it's children inside the "body" of it's parent. Instead, it's rendered as direct children of document.body(<body>). Layout properties are used to measure size and position. One example of use is a combo box which displays a child view below a button or input box. See layout.LayoutSpec for the available position and sizing properties available to children inside a popup layout.