combobox inside DBgrid

could you please teach me how to put a combobox inside DBgrid.. i have a table “profiles” the fields are

if we bind profiles in DBgrid we have 3 columns and many rows… how can i put the combobox in column 1 which is lname… when i click the combobox inside the DBgrid the combobox list shows all the lname records…
i have a link to planet-source-code.com but i cant find it..
please help i cant proceed to another if i cant finish about combobox… thank you