Bug 180645 Support set format for Date/Time type parameter.[0705]
Description: Support set format for Date/Time type parameter. Build number:2.2.0.v200704031345 Steps to reproduce: 1. New a Date report parameter. 2. Click Change... button to set format for it. Expected result: Can set format for Date/Time parameter. Actual result: Change... button is disabled. Error log:N/A
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/internal/ui/dialogs/FormatDateTimePage.java
*/
	private java.util.List listeners = new ArrayList( );
	private Date defaultDate = new Date( );
	private String defaultDateTime = new DateFormatter( "Unformatted" ).format( defaultDate ); 
	/**
	 * Constructs a page for formatting date time, default aligns the page
	 * virtically.
	 * 
	 * @param parent
	 *            The container
	 * @param style
	 *            The style of the page
	 */
	public FormatDateTimePage( Composite parent, int style )
	{
		this( parent, style, PAGE_ALIGN_VIRTICAL );
	}
	/**
	 * Constructs a page for formatting date time.
	 * 
	 * @param parent
	 *            The container
	 * @param style
	 *            The style of the page
	 * @param pageAlignment
	 *            Aligns the page virtically(PAGE_ALIGN_VIRTICAL) or
	 *            horizontally(PAGE_ALIGN_HORIZONTAL).
	 */
	public FormatDateTimePage( Composite parent, int style, int pageAlignment )
	{