I am trying to use the User Preferences part of the grid.
By default all columns show and when I unclick all and click any other column, I get the following error:

ReferenceError: Error #1069: Property name not found on com.flexicious.grids.columns.XXXXX and there is no default value.

Answer:

This happens when you are using a newer version of the library (1.4+) with an older version of the sample code.

Steps to resolve:

1) Go to http://www.flexicious.com/resources/Flex/srcview/index.html

2) Download Source(from the bottom left hand corner)

3) From the zip, pick up the SaveSettingsPopup.mxml file, and overwrite the version of this file in your project with the updated file from the zip.