Why is the compiler complaining about a possibly undefined property - apache-flex

Question

I have a very simple practice program for Flex 4 ( Gumbo ).
package
{
import mx.controls.ColorPicker;
import mx.controls.Label;
import mx.events.ColorPickerEvent;
import flash.display.Sprite;
public class testClass extends Sprite
{
private var cPicker:ColorPicker = new ColorPicker();
private var lbl:Label;
public function testClass()
{
cPicker.addEventListener(ColorPickerEvent.CHANGE,
colorPicker_change);
cPicker.move(10, 10);
addChild(cPicker);
lbl = new Label();
lbl.text = cPicker.hexValue;
lbl.move(10, 40);
addChild(lbl);
}
private function colorPicker_change(evt:ColorPickerEvent):void
{
lbl.text = cPicker.hexValue; // ff0000
}
}
}
But after building with 'mxmlc.exe testClass.as' on the command line, I get...
C:\src>mxmlc testClass.as Loading configuration file
C:\flex_sdk_4\frameworks\flex-config.xml
C:\src\testClass.as(21): col:
32 Error: Access of possibly undefined
pro perty hexValue through a reference
with static type
mx.controls:ColorPicker.
lbl.text = cPicker.hexValue;
^
C:\src\testClass.as(28): col:
32 Error: Access of possibly undefined
pro perty hexValue through a reference
with static type
mx.controls:ColorPicker.
lbl.text = cPicker.hexValue; // ff0000
^
Why does it think that cPicker is static? Or that cPicker.hexValue is undefined?
Also it seems that even after importing the ColorPicker library in the code using the import keyword, I somehow have to import it on the commandline for building as well. Is that correct?

Answer 1

According to my reading of the documentation hexValue isn't a property available on the ColorPicker. Do you mean selectedColor?