custom widget and styling with master .tss

hi I have an alloy project and within the project i have created a custom checkbox widget.

In the checkbox widget.js, I have the following code to take in args and initialize x, y, position of the widget. These parameters are passed in from my parent alloy project when calling Alloy.CreateWidget().

// widget.js
 
var _args = arguments[0] || {};
$.chkbox.backgroundImage = "grayplus.png";
$.chkbox.left = _args.left;
$.chkbox.top = _args.top;

Ideally I would like to pass in the x, y, width, height info to the widget from my parent alloy project's .tss file. What method do i need to implement in my custom widget file to intercept these .tss file configs (such as x, y, width, height, etc)?

Thanks.