DataGrid 2: drop down filters dependent on other drop down filters?

Is there currently already a way to have drop down filters in a DataGrid 2 that are dependent on other drop down filters?   Imagine for instance you have a list of contracts and every contract is linked to a country and a region. A country is also linked to a region.   What I want to do is that if a user selects an item in the region filter, like for instance EMEA, the country filter only shows the countries of EMEA and not the entire world.
1 answers

I also have same question. I tried xpath way, but it didn't work. Because I can not find the specific associated object that I wanted.