Combo box Multi select option is working in properly working in Thingworx 8.2. But In Thingworx 8.4 Multi select is not working. After clicking checkbox to select the rows in Combo box I couldn' able to get the selected rows. I have attached the screenshots of service bindings and results for your reference.
Could you specify which exact version of ThingWorx 8.4 you are using (maybe a screenshot of Composer > Help will be good).
I see also you seem to be using a advanced grid, if that is the case can you clarify where did you get the extension from and what version you are using.
I have made a test in 8.4.1 with a standard grid and that worked for me. I have attached my entities if you want to test/check the difference with yours. Note use the service AddValues in CMODT82 DataTable to enter some values and then load the mashup CMOListMashup.
In my Thingworx 8.4 version, I checked Grid is Properly is working. My Problem is I coudn't able to fetch the Selected rows from Service after checkbox multiple selection in Combo box.
We do retrieve the selected row of one service into the combobox in those entities, it seems to be the same scenario as your unless I misunderstand something.
