DevExpress SearchLookUpEdit

Question

Hi all.

 

I am very new to C# windows form developer using entity framework in v.s. 2013. 

 

I have two  DevExpress searchLookUpEdit drop down buttons.

 

the first one contains a searched value (eg Parent name from a list of Parents) 

 

the second one should now contain the names of students each parent has.

 

my question is how do I filter the second  searchLookUpEdit to give me a list of only the students whose father is displayed in the first searchLookUpEdit.

 

Thanks.