A SplitPane is used to divide two Widgets. These widgets can be resized by tapping the splitter widget and moving the slider.   The orientation property states if the widgets should be aligned horizontally or vertically.     Example     Here is a little example of how to use the widget.     <pre class='javascript'>   var pane = new qx.ui.splitpane.Pane("vertical");   var leftWidget = new qx.ui.form.TextArea("Fixed");   leftWidget.setWidth(100);   leftWidget.setWrap(true);   var rightWidget = new qx.ui.form.TextArea("Flex")     pane.add(leftWidget, 0);   pane.add(rightWidget, 1);     container.add(pane, {left: 10, top: 10});  <pre>     This example creates a new horizontal SplitPane and adds two TextArea widgets. The   first TextArea has a static (flex value 0) size of 100px, the second one will use the   available space (flex value 1) for its width.     External Documentation     <a href='http:manual.qooxdoo.org${qxversion}pageswidgetsplitpane.html' target='_blank'>   Documentation of this widget in the qooxdoo manual.<a>