Hello!
A general problem is as follows:
There is a database table that has a relationship with another on the key. Since the connected table can be very large, using ComboBox to the data from the connected table is not very convenient. Decided to do that when you click on the cell context, it could push a button and there was a connected table.
Actually there is the realization of this idea or something like that can be replaced?

Thank you.
Pardoned for my english.