Scott Evans posted this test case

<canvas height="500" width="500">
 <inputtext id="i1" width="150"
            bgcolor="${this.enabled ? 0xffffff : 0xff0000}">
     <handler name="onenabled">
         Debug.write("onenabled");
     </handler>
      This text is editable.</inputtext>

 <button y="20" onclick="i1.setAttribute('enabled',! i1.enabled)">
     toggle
 </button>
</canvas>

The onenabled event is never sent .

The setter (in trunk and legals) neglects to send the event

A patch is to put if (this.onenabled) {
        this.onenabled.sendEvent(enabled);
    }
in the setter (setEnabled())