Full code after the jump.

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/09/setting-the-horizontal-divider-cursor-on-an-hdividedbox-container-in-flex/ -->
<mx:Application name="HDividedBox_horizontalDividerCursor_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:HDividedBox id="hDividedBox"
            horizontalDividerCursor="@Embed('assets/arrow_refresh.png')"
            width="100%"
            height="100%">
        <mx:HBox backgroundColor="haloGreen"
                width="100%"
                height="100%">
        </mx:HBox>
        <mx:HBox backgroundColor="haloBlue"
                width="100%"
                height="100%">
        </mx:HBox>
    </mx:HDividedBox>

</mx:Application>

View source is enabled in the following example.

You can also set the horizontalDividerCursor style using an external .CSS file or <mx:Style /> block, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/09/setting-the-horizontal-divider-cursor-on-an-hdividedbox-container-in-flex/ -->
<mx:Application name="HDividedBox_horizontalDividerCursor_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Style>
        HDividedBox {
            horizontalDividerCursor: Embed("assets/arrow_refresh.png");
        }
    </mx:Style>

    <mx:HDividedBox id="hDividedBox"
            width="100%"
            height="100%">
        <mx:HBox backgroundColor="haloGreen"
                width="100%"
                height="100%">
        </mx:HBox>
        <mx:HBox backgroundColor="haloBlue"
                width="100%"
                height="100%">
        </mx:HBox>
    </mx:HDividedBox>

</mx:Application>

Or, you can set the horizontalDividerCursor style using ActionScript, as seen in the following example:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/09/setting-the-horizontal-divider-cursor-on-an-hdividedbox-container-in-flex/ -->
<mx:Application name="HDividedBox_horizontalDividerCursor_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white">

    <mx:Script>
        <![CDATA[
            [Embed("assets/arrow_refresh.png")]
            private const ArrowRefreshIcon:Class;

            private function hDividedBox_init():void {
                hDividedBox.setStyle("horizontalDividerCursor", ArrowRefreshIcon);
            }
        ]]>
    </mx:Script>

    <mx:HDividedBox id="hDividedBox"
            width="100%"
            height="100%"
            initialize="hDividedBox_init();">
        <mx:HBox backgroundColor="haloGreen"
                width="100%"
                height="100%">
        </mx:HBox>
        <mx:HBox backgroundColor="haloBlue"
                width="100%"
                height="100%">
        </mx:HBox>
    </mx:HDividedBox>

</mx:Application>

Due to popular demand, here is the “same” example in a more ActionScript friendly format:

View MXML

<?xml version="1.0" encoding="utf-8"?>
<!-- http://blog.flexexamples.com/2008/10/09/setting-the-horizontal-divider-cursor-on-an-hdividedbox-container-in-flex/ -->
<mx:Application name="HDividedBox_horizontalDividerCursor_test"
        xmlns:mx="http://www.adobe.com/2006/mxml"
        layout="vertical"
        verticalAlign="middle"
        backgroundColor="white"
        initialize="init();">

    <mx:Script>
        <![CDATA[
            import mx.containers.HBox;
            import mx.containers.HDividedBox;

            [Embed("assets/arrow_refresh.png")]
            private const ArrowRefreshIcon:Class;

            private var hDividedBox:HDividedBox;
            private var hBox1:HBox;
            private var hBox2:HBox;

            private function init():void {
                hBox1 = new HBox();
                hBox1.percentWidth = 100;
                hBox1.percentHeight = 100;
                hBox1.setStyle("backgroundColor", "haloGreen");

                hBox2 = new HBox();
                hBox2.percentWidth = 100;
                hBox2.percentHeight = 100;
                hBox2.setStyle("backgroundColor", "haloBlue");

                hDividedBox = new HDividedBox();
                hDividedBox.percentWidth = 100;
                hDividedBox.percentHeight = 100;
                hDividedBox.addChild(hBox1);
                hDividedBox.addChild(hBox2);
                hDividedBox.setStyle("horizontalDividerCursor",
                            ArrowRefreshIcon);
                addChild(hDividedBox);
            }
        ]]>
    </mx:Script>

</mx:Application>