ConvertPage method, if you want more information check out capturing dynamic content.
<label>Name</label> <input type="text" name="fullname" value="Sam"/><br/>
<label>Order</label> <select name="order">
<input type="button" value="Take Screenshot" onclick="createScreenshot();"/>
//dynamically capture the page and add it to the div.
GrabzIt("Sign in to view your Application Key").ConvertPage().AddTo('divResult');