Combobox/Listbox problem (not too serious)

BattleGuard

Hello World,
Ok, I have this Combo, or listbox, but I don't know how to put the event when somebody click a button after they select a font, which is in the collection of the combobox. So i have another Rich Text Box and i want the font of that textbox to change when ssomebody chooses another font. The real problem is that i can't choose the particular item's event. I can't select that item in making mode. Can somebody tell me how to select a combobox's item and then write the event for that item, when selected and pressed button1.

Help!!!
Dhruv(BattleGuard)

THX