Popup Dialogue to Select Multiple Instead of Just One

[MBench]

Hey all,

I'm still fairly new to Marionette, so forgive me if I'm asking something that may not be possible. But I'm looking to generate a popup dialogue that would allow the user to choose multiple items at once to insert them into the document, rather than one at a time. Is it possible to do this? My thinking was to use check boxes for choosing the items, rather then the drop down list. But I don't know if this is doable.

Thank you in advance!