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
group.setText( LABEL_PREVIEW_GROUP ); 
		if ( pageAlignment == PAGE_ALIGN_HORIZONTAL )
		{
			group.setLayoutData( new GridData( GridData.FILL_BOTH ) );
			group.setLayout( new GridLayout( 1, false ) );
		}
		else
		{
			group.setLayoutData( new GridData( GridData.FILL_HORIZONTAL ) );
			group.setLayout( new GridLayout( 2, false ) );
		}
		new Label( group, SWT.NONE ).setText( LABEL_PREVIEW_DATETIME ); 
		previewTextBox = new Text( group, SWT.SINGLE | SWT.BORDER );
		previewTextBox.setText( defaultDateTime );
		GridData data = new GridData( GridData.FILL_HORIZONTAL );
		if ( pageAlignment == PAGE_ALIGN_HORIZONTAL )
		{
			data.horizontalIndent = 10;
		}
		previewTextBox.setLayoutData( data );
		previewTextBox.addModifyListener( new ModifyListener( ) {
			public void modifyText( ModifyEvent e )
			{
				setDefaultPreviewText( previewTextBox.getText( ) );
				if ( hasLoaded )
				{
					updatePreview( );
				}
				if ( StringUtil.isBlank( previewTextBox.getText( ) ) )
				{