dynamic placeholder / datagrid??

[Sean]

Hi,

I am trying to get this piece of code to work.

I have to design a GUI which would look similar to
=====================================================
Month |Year |Old | New
dropdown |dropdown |4 | dropdown
dropdown |dropdown |2 | dropdown
dropdown |dropdown |1 | dropdown

[ADD] [DELETE]
=====================================================
The functionality would be on start I will have just one row, with only
the Month dropdown and Year dropdown available.

After the user, selects the month, and the year, I will populate the
Old label with a value which will be retrieved from the backend and
enable New dropdown with a set of new values.

I have been debating of using a placeholder for each row or use a
Datagrid.

I am trying to use placeholder for now, but would like to know if
anyone has any thoughts on how to go about coding a page like this.

Thinking of datagrid, am not sure how to go about adding a value(Old)
and populating a (New) dropdown.

Any thoughts or advice.

Thank You