Bug 190727 [regression]Default value issue when switch report parameter from textbox to listbox.[0705]
UI/org.eclipse.birt.report.designer.ui/src/org/eclipse/birt/report/designer/ui/dialogs/ParameterDialog.java
{
				newControlType = DesignChoiceConstants.PARAM_CONTROL_LIST_BOX;
				
				inputParameter.setMustMatch( false );
			}
			else if ( PARAM_CONTROL_LIST.equals( newControlType ) )
			{
				newControlType = DesignChoiceConstants.PARAM_CONTROL_LIST_BOX;
				
				inputParameter.setMustMatch( true );
			}
			else
			{
				inputParameter.setProperty( ScalarParameterHandle.MUCH_MATCH_PROP,
						null );
			}
			
			inputParameter.setControlType( newControlType );
			
			if ( DesignChoiceConstants.PARAM_TYPE_DATETIME.equals( getSelectedDataType( ) ) )
			{
				defaultValue = DEUtil.convertToXMLString( DataTypeUtil.toDate( defaultValue,
						ULocale.US ) );
			}
			inputParameter.setDefaultValue( defaultValue );
			
			inputParameter.setDataType( DATA_TYPE_CHOICE_SET.findChoiceByDisplayName( dataTypeChooser.getText( ) )
					.getName( ) );
			
			PropertyHandle selectionChioceList = inputParameter.getPropertyHandle( ScalarParameterHandle.SELECTION_LIST_PROP );