Basically you can render different template based on conditional logic like explained here:
To actually achieve this I would suggest you to put a single input element in the template (with some class) and use the dataBound
event of the Grid to initialize the DropDownList. To get a reference to the model while initializing the different DropDownList you can use the dataItem
method of the Grid.
To get the idea please take a detail look at the following example:
It uses absolutely the same approach like the one that I explained above, however it uses a field which actually holds the whole collection (in your case you might just need an id to configure the remote transport of your DropDownList) to initialize the Chart.
I hope this gives you the idea and helps you achieve your goal.
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