I have a similar use case. I do the following
- DynamicForm with one ComboBoxItem with the picker icon hidden like you mentioned
- ComboBoxItem has setPickListProperties(searchListGrid)
- searchListGrid has many columns and a addCellClickHandler for the actual action
- ComboBoxItem has addEditorExitHandler that clears the ComboBoxItem via clearValue()
Best regards
Blama
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