Use addChildAt() to add the CheckBox control to VBox

       
<?xml version="1.0"?>
<mx:Application xmlns:mx="http://www.adobe.com/2006/mxml">
    <mx:Script>
        
        import mx.controls.CheckBox;
        import mx.controls.Alert;
        private var myCheckBox:CheckBox;
        private var checkBoxDisplayed:Boolean = false;
    
        public function addControlButton():void {
            if(checkBoxDisplayed == false){
                if (!myCheckBox) {
                    myCheckBox = new CheckBox();
                }
                myCheckBox.label = "New CheckBox";
                myVBox.addChildAt(myCheckBox, 0);
                checkBoxDisplayed=true;
            }
        }
        public function deleteControlButton():void {
            if(checkBoxDisplayed){
                myVBox.removeChild(myCheckBox);
                checkBoxDisplayed=false;
            }
        }

      
    </mx:Script>
    <mx:VBox id="myVBox">
        <mx:Button label="Add CheckBox" click="addControlButton();" />
        <mx:Button label="Remove CheckBox" click="deleteControlButton();" />
    </mx:VBox>
</mx:Application>

1.	Use CheckBox click event
2.	Set checkbox menu item checked
3.	Use to define a CheckBox control
4.	Use selected property to create a checked checkbox
5.	A form with a CheckBox control
6.	CheckBox Item Renderer
7.	Register function to a Button control and CheckBox control
8.	Use CheckBox to control Button enabled state
9.	CheckBox renderer for DataGridColumn
10.	CheckBox Checked event
11.	Use setChildIndex() to move a CheckBox control down the display list
12.	Using the selected property to generate a checkbox that is checked by default
13.	Image is not visible until the user selects the checkbox
14.	Inline DataGrid CheckBox Editor
15.	Inline DataGrid CheckBox Editor With Offsets
16.	CheckBox control named myCB appears when you change to any view state in Group
17.	ChekcBox with Label

Use addChildAt() to add the CheckBox control to VBox : CheckBox « Components « Flex

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