Hi,Sorry about the late reply.In 3.4 we modified the way the AttributeInspector works to let developers be able to customize the components display to edit feature's field.Basically in order to migrate your custom AttributeInspectorSkin, you need to add:
<fx:Declarations>
<fx:Component id="codedValueDomainField">
<fieldClasses:CodedValueDomainField minWidth="200"/>
</fx:Component>
<fx:Component id="dateField">
<!--
Display dates in local time, using a localized short date format. eg: for en_US: MM/DD/YYYY
See PopUpFieldFormat date formats or provide a custom one.
-->
<fieldClasses:CalendarField dateFormat="shortDate" useUTC="false"/>
</fx:Component>
<fx:Component id="doubleField">
<!--
By default the maximum number of digits after de decimal separator is 16, but it's customizable.
-->
<fieldClasses:DoubleField fractionalDigits="16" minWidth="200"/>
</fx:Component>
<fx:Component id="integerField">
<fieldClasses:IntegerField minWidth="200"/>
</fx:Component>
<fx:Component id="labelField">
<fieldClasses:LabelField minWidth="200"/>
</fx:Component>
<fx:Component id="memoField">
<fieldClasses:MemoField minWidth="200"/>
</fx:Component>
<fx:Component id="rangeDomainField">
<fieldClasses:RangeDomainField minWidth="200"/>
</fx:Component>
<fx:Component id="singleField">
<fieldClasses:DoubleField minWidth="200"/>
</fx:Component>
<fx:Component id="smallIntegerField">
<fieldClasses:IntegerField minWidth="200"/>
</fx:Component>
<fx:Component id="stringField">
<fieldClasses:StringField minWidth="200"/>
</fx:Component>
<fx:Component id="textField">
<fieldClasses:TextField minWidth="200"/>
</fx:Component>
<fx:Component id="typeField">
<fieldClasses:TypeField minWidth="200"/>
</fx:Component>
</fx:Declarations>