Bug 153391 Some Options in Edit Parameter dialog haven't been saved.
Description: Some Options in Edit Parameter dialog haven't been saved. Steps to reproduce: 1. new a parameter, boolean type, tick AllowNUll and sort alphabetically... 2. Close the dialog and reopen it. 3. new a parameter, string, combo-box, tick AllowNull. 4. Close the dialog and reopen it. Expected result: Ticked options' status are saved Actual result: After reopen parameter dialog, options are unticked.
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
displayFormat += ": " + formatPattern; 
				}
				if ( type.equals( DesignChoiceConstants.PARAM_TYPE_DATETIME ) )
				{
					previewString = new DateFormatter( DesignChoiceConstants.DATETIEM_FORMAT_TYPE_CUSTOM.equals( formatCategroy ) ? formatPattern
							: formatCategroy,
							ULocale.getDefault( ) ).format( new Date( ) );
				}
				else if ( type.equals( DesignChoiceConstants.PARAM_TYPE_STRING ) )
				{
					previewString = new StringFormatter( formatCategroy != DesignChoiceConstants.STRING_FORMAT_TYPE_CUSTOM ? formatCategroy
							: formatPattern,
							ULocale.getDefault( ) ).format( Messages.getString( "ParameterDialog.Label.Sample" ) ); 
				}
				else if ( type.equals( DesignChoiceConstants.PARAM_TYPE_INTEGER ) )
				{
					previewString = new NumberFormatter( formatCategroy != DesignChoiceConstants.NUMBER_FORMAT_TYPE_CUSTOM ? formatCategroy
							: formatPattern,
							ULocale.getDefault( ) ).format( 1234567890 );
				}
				else
				{
					previewString = new NumberFormatter( formatCategroy != DesignChoiceConstants.NUMBER_FORMAT_TYPE_CUSTOM ? formatCategroy
							: formatPattern,
							ULocale.getDefault( ) ).format( 123456789.01234 );
				}
			}
		}
		formatField.setText( displayFormat );
		previewLabel.setText( convertNullString( previewString ) );