How do i give static arraycollection for advancedatagridcolumn combobox?

gm guys,

i have my advance datagrid in which one advancedatagridcolumn header contains combobox.whenn i click on combox it displays list and by selecting employee designation it shows records related it from database.now my problem is that i want to display those records with static array not with database.

how do i solve that problem?please help me i am stucking on that problem.if possible give me code.

thanks & regards,
kk