Flex：在验证失败时强制显示控件的errorTip(错误工具提示)

如果你只想“强制”弹出错误提示,这就是我的工作：

public function showErrorImmediately(target:UIComponent):void
    {
        // we have to callLater this to avoid other fields that send events
        // that reset the timers and prevent the errorTip ever showing up.
        target.callLater(showDeferred,[target]);
    }

    private function showDeferred(target:UIComponent):void
    {
        var oldShowDelay:Number = ToolTipManager.showDelay;
        ToolTipManager.showDelay = 0;
        if (target.visible)
        {
            // try popping the resulting error flag via the hack 
            // courtesy Adobe bug tracking system
            target.dispatchEvent(new MouseEvent(MouseEvent.MOUSE_OUT));
            target.dispatchEvent(new MouseEvent(MouseEvent.MOUSE_OVER));
        }
        ToolTipManager.showDelay = oldShowDelay;
    }

    public function clearErrorImmediately(target:UIComponent):void
    {
        target.callLater(clearDeferred,[target]);
    }

    private function clearDeferred(target:UIComponent):void
    {
        var oldDelay:Number = ToolTipManager.hideDelay;
        ToolTipManager.hideDelay = 0;
        if (target.visible)
        {
            // clear the errorTip
            try
            {
                target.dispatchEvent(new MouseEvent(MouseEvent.MOUSE_OVER));
                target.dispatchEvent(new MouseEvent(MouseEvent.MOUSE_OUT));
            }
            catch (e:Error)
            {
                // sometimes things aren't initialized fully when we try that trick
            }
        }
        ToolTipManager.hideDelay = oldDelay;
    }