Double-Click ListBox entry - assign result to a variable

In the attached file the user-form (uf_OpenWorkbooks) lists the open excel workbooks.
It instructs the user to double-click the required workbook, or cancel if the workbook is not open.

What code do I need to use to assign the double-clicked entry to the variable that will be used in the next part of the macro, I.e. activate the chosen workbook?

So far I have succeeded to activate the chosen workbook by clicking OK.


Thanks very much
ShowOpenWorkbooks.xlsm