problem with listbox

How are you adding to the listbox?

are you adding strings manually?
are you adding a datasource?
are you getting errors? if so what are they?

you must be doing it wrong then......

Update your original question with more details. For instance, show us a code snippet showing how you're trying to add items. You say in a comment that you're "adding through datasource". How? Are you setting stuff in code or through the IDE? What properties are you setting and what are you setting them to? We can help, but only if you give us the information to do so.