Use a Button control inside the HBox

          
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
    import mx.controls.Button;
    public var button2:Button;
    public function createObject():void {
        button2 = new Button();
        button2.label = "Click Me";
        hb1.addChild(button2);
    }
  </mx:Script>
    <mx:HBox id="hb1">
        <mx:Button label="Create Object" click="createObject()" />
    </mx:HBox>
</mx:Application>

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15.	HBox container with scroll bars
16.	Turns on verticalScrollPolicy for HBox
17.	Add border to HBox
18.	Adding padding by direction to HBox
19.	HBox with vertical top alignment and horizontal left alignment
20.	image is centered in the HBox container
21.	image might extend past the boundaries of the HBox
22.	not to autoLayout for HBox
23.	Spacer placed inside an HBox can separate the controls to its left and right
24.	Use an HBox container to let users scroll an image, rather than rendering the complete image at its full size.
25.	Scroll HBox
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27.	Layout controls with HBox
28.	Using constraint-based layout to position an HBox horizontally, and uses absolute values to specify the vertical width and position
29.	Using the clipContent property
30.	Fixed size container
31.	use removeChild() method to remove a control from a container

Use a Button control inside the HBox : HBox « Container « Flex

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