Writing new stylesheet or editing the V2 is headache for me. So I have created my own checkbox component. Hope will help you in your projects.

Difficulty of Use:
Intermediate to advanced users.

Sample component1:

Code for Sample1:

import com.Designscripting.Components.ICheck;

	var _icheck:CheckButton = new CheckButton();
		_icheck.index = 1;
		_icheck.x = _icheck.y = 60;
		_icheck._txt.text = "SampleData 1";
		_icheck._btn.addEventListener(MouseEvent.CLICK, buttonClicked);
		addChild(_icheck);

function buttonClicked(e:MouseEvent):void
{
	//Code to open URL in _blank window.
	navigateToURL( new URLRequest("http://www.designscripting.com/"), "_blank");
	ICheck.setItem(e.target.parent);
}

Here we are importing the custom classes and creating an instance for CheckButton and adding it to display list.
Later on selecting the checkbox we are launching the URL:designscripting.com

Some Useful Functions of the Component:

• setItem()
• getSelectedIndices()
• getSelectedData()
• isItemSelected()

setItem: Static method to set the checkbox item selected.

getSelectedIndices: Static method to return selected index of checkbox, return type Array.

getSelectedData: Static method to return selected data of checkbox, return type Array.

isItemSelected: Static method to return checkbox is selected or not. return type Boolean.

Sample Component 2:

Code for Sample2:

import com.Designscripting.Components.ICheck;

var verticalSpacing:Number = 50;

for(var count:int =0; count<3; count++)
{
	var _icheck:CheckButton = new CheckButton();
	_icheck.x = 40
	_icheck.y = 70+count*verticalSpacing;
	_icheck.index = count;
	_icheck._txt.text = "SampleData "+count;
	_icheck._btn.addEventListener(MouseEvent.CLICK, buttonClicked);
	addChild(_icheck);
}

function buttonClicked(e:MouseEvent):void
{
	ICheck.setItem(e.target.parent);
}
resultMc.buttonMode = clearMc.buttonMode = true;
resultMc.addEventListener(MouseEvent.CLICK, function(e:MouseEvent){
	_resultTxt.text = String("Selected Item\n"+ICheck.getSelectedIndices())
	trace(ICheck.getSelectedData())
	})
clearMc.addEventListener(MouseEvent.CLICK, function(e:MouseEvent){ICheck.reset();_resultTxt.text = ""})

Find the source files attached.