function updateFieldHelp(sPropertyName) {
		// "this" is the managed object on which this function is called
		if (sPropertyName) {
			oFieldHelp._updateProperty(this, sPropertyName);
		} else {
			oFieldHelp._updateElement(this);
		}
	}
Replacement for <code>ManagedObject.prototype.updateFieldHelp</code> to update the field help information
for the given control property name of <code>this</code> control instance, if the corresponding binding has been
created or destroyed, or its context has been changed.

@param {string} sPropertyName
  The name of the control property for which the field help information has to be updated