Combo box that load data automatically when mouse over the combo box

[nad nadia]

hello guys.. i am a beginner.. so i totally burr about tis.. so need yout help.. and if possible give me step by step..
the prob is..
I want to create a combo box which load its data automatically when user click the combo box. and the data is retrieve from database SQL, that means, once mouse over the combo box, it will call a function to load the data. If not, the combo box is remain empty.

thanks for any help.

[Bear Bibeault]

Please do not cross-post the same question in multiple forums. It wastes people's time when multiple redundant conversations take place.