title: Creating widgets based on a list
body: <p>I have a parameter n, and i have to create n textfields and listen to them, and capture the value of all these fields. 
  Say I have to perform calculations on them. How do I achieve this? I tried to combine loops with widgets but I get lots of errors. </p>
  
  <p>When I used a separate function to return a list of widgets for column's children property, it throws an error stating <code>type int is not a subtype of type string of source</code>. </p>