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The OutSystems Forge is a repository of reusable, open code modules, connectors, and UI components to help speed up app delivery time.
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result for tag 
"multiple-selection"
MultipleSelection
by 
Palash Debnath
Multiple Selection using checkbox on a combo box records.
Latest version 
1.0.3  (O11)
Latest release
2 May
Also available for 10
checkbox
checkbox in Combobox
combobox
multiple-selection