Field-anchored picklist

Drop-down picklist windows can be displayed under the current field.

In order to show a drop-down picklist below the current field, set the "position" style attribute for Window elements to "field":
  <Style name="Window.dropdown">
     <StyleAttribute name="position" value="field" />

Additional Window style attributes are required to get the expected rendering. For example, we remove the border, system menu, statusbar, action panel, etc, to get a minimal window frame.

For a complete example, see Field-anchored windows.