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I assume you're talking about creating a custom SUDialog for DIAdem, right? In that case, you can indeed use a ListBox to enable multiple item selection.
Are you wanting to filter the tree view in the NAVIGATOR "File Browser" tab or the table of query results in the NAVIGATOR "Search Results" tab?
If you're talking about a SUDialog, then there is no native control that supports multi-item select in a combobox form factor. The only native option for multi-item select is the listbox control.
Of course, you can import any ActiveX control (*.ocx) you want into a SUDialog and show it in the native ActiveX control, but then you're on your own for programming that external control and ensuring that it's registered on all the target computers you want to deploy the SUDialog onto.