Bug 134949 Themes nest in other library
Details: Themes nest in other library Step: 1. Library A use LibraryB, and Library B has a themes 2. Report design use Library A 3. I open the Library tree of A in library explorer and drop the themes from B into layout. Actual result: It pop up an error message and said that the library namespace "B" exists already. Exception result: I don't konw if I can use by this method. But I think it is a method user may be used.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/views/attributes/providers/ChoiceSetFactory.java
{
	public static final String CHOICE_NONE = Messages.getString( "ChoiceSetFactory.choice.None" ); 
	public static final String CHOICE_AUTO = Messages.getString( "ChoiceSetFactory.choice.Auto" ); 
	/**
	 * Gets the collection that given property value can selected from them.
	 * 
	 * @param property
	 *            DE Property key.
	 * @return The ChoiceSet instance contains all the allowed values.
	 * @deprecated Use getDEChoiceSet( String property ,String elementName)
	 *             instead
	 */
	public static IChoiceSet getDEChoiceSet( String property )
	{
		String unitKey = DesignChoiceConstants.CHOICE_UNITS;
		if ( AttributeConstant.BACKGROUND_COLOR.equals( property ) )
		{
			unitKey = IColorConstants.COLORS_CHOICE_SET;
		}
		else if ( AttributeConstant.FONT_COLOR.equals( property ) )
		{
			unitKey = IColorConstants.COLORS_CHOICE_SET;
		}
		else if ( AttributeConstant.FONT_SIZE.equals( property ) )
		{
			unitKey = DesignChoiceConstants.CHOICE_FONT_SIZE;
		}
		else if ( AttributeConstant.FONT_FAMILY.equals( property ) )
		{