I'm trying to create a simple ComboBox subclass that defaults to the
open position, automatically displaying it's dropdown list. I'm
trying to implement this as an itemRenderer for a DataGrid.
Each time I call the open() function on the ComboBox subclass, it
refuses to open. The dropdown list returns null at these key
initialization events, so perhaps the open() call is rejected as the
dropdown list hasn't been instantiated yet. I thought that was the
point of the open() call?
Setup: Mac OS X 10.4.10, Flex Builder 3.
Anyhow, here's my hacky attempt at this subclass. Any input would be
appreciated:
package com.plasticbrain.controls {
import flash.events.Event;
import mx.controls.ComboBox;
import mx.events.FlexEvent;
public class ComboBoxOpen extends ComboBox {
// Constructor.
public function ComboBoxOpen() {
super();
this.addEventListener(Event.ADDED_TO_STAGE,
this.onAddedToStage);
}
private function onAddedToStage(evt:Event):void {
// Try to open the ComboBox (doesn't work).
this.open();
this.removeEventListener(Event.ADDED_TO_STAGE,
this.onAddedToStage);
this.addEventListener(FlexEvent.DATA_CHANGE,
this.onDataChange); }
private function onDataChange(evt:FlexEvent):void {
// Try again to open the ComboBox (still doesn't work).
this.open();
this.removeEventListener(FlexEvent.DATA_CHANGE,
this.onDataChange);
}
}
}
