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
value = choice.getLabel( );
					if ( value == null )
					{
						value = choice.getValue( );
					}
					if ( value == null )
					{
						value = LABEL_NULL;
					}
					if ( value.equals( newValue ) )
					{
						return true;
					}
				}
			}
		}
		return false;
	}
	private void popupFormatBuilder( boolean refresh )
	{
		String dataType = getSelectedDataType( );
		int formatType;
		if ( DesignChoiceConstants.PARAM_TYPE_BOOLEAN.equals( dataType ) )
		{
			return;
		}
		if ( DesignChoiceConstants.PARAM_TYPE_STRING.equals( dataType ) )
		{
			formatType = FormatBuilder.STRING;
		}