Open New Form Unloads Checkedlistbox Control?

There is probably a good reason for this but I haven't worked with multiple forms while keeping controls from unloading before.

The process I've always used to open new forms and go back and forth is below. Once I open a new form, get a value from the user and go back to the original form, the checkedlistbox.checkedindices value on the original form is then 0, though it was a positive value when going to the new form (I can tell that the original form is reinitialized when coming back to it so it makes sense that the controls would be empty at that point).

What is the best/proper way to control multiple forms and keep control properties available the entire time?[code]...