An element which should appear before or after an element inside a box (Box, Vbox and Hbox).

When the splitter is dragged, the sibling elements of the splitter are resized. If getCollapse() is true, a grippy in placed inside the splitter, and one sibling element of the splitter is collapsed when the grippy is clicked.

<hbox spacing="0" width="100%">
    <vbox height="200px">    
        Column 1-1: The left-top box. To know whether a splitter        
        is collapsed, you can listen to the onOpen event.        
        <splitter collapse="after"/>        
        Column 1-2: You can enforce to open or collapse programming        
        by calling setOpen method.        
    </vbox>    
    <splitter collapse="before"/>    
    Column 2: Whether a splitter allows users to open or collapse    
    depending on the collapse attribue.    
</hbox>