Custom field type for replacing MultiLookup in Sharepoint 2010. Where to inherit?

Question

I am developing a custom field type that should look like MultiLookup (two lists, add and remove buttons - buttons). But I do not want to save this data in the List that contains this field. In other words: fully customizable code must occur.

I have an idea how to solve it, but I don’t know what type I should get my user control from. Or this is not the case when I redefine FieldRenderingControl and I can just use

public class MyCustomField:SPFieldText 

?

Answer 1

It doesn’t matter if you don’t save the data in the list. Choose the one that has the smallest size, boolean or so (I don't know the name for sure).