I'm sure this is probably pretty simple, but how do I
populate a ListBox with only the populated cells in a
worksheet?

For example:

Column A Column B Column C Column D
2.3 45 23.98 43.981
90 45.877 32.2 3

The ListBox would show all of these numbers using the
first row as column headers. The number of rows is
different everytime, that's why I can't just specify a
range within the ListBox.

Any help would be appreciated