combo boxs

Hi all

Please excuse my ignorance I am very new to writing windows store apps

I have 2 combo boxes CB1 has 4 items

I want to be able to select any of the four items and depending on which item is selected it then populates the second combobox with a number of items which will differ depending on which item is selected

I presume its some sort of code in the selection change event that I need such as an if statement

can anyone point me in the right direction on how to do this

Thanks in advance

Mark