SelectItem using optionDataSource and groupByField does not preserve selection

[nitroamos]

If I put the following code

isc.DynamicForm.create({
    ID: "testForm",
    width: 500,
    fields: [
        {
            name: "multipleSelect", title: "Select items", editorType: "SelectItem",
            optionDataSource: "supplyItem",
            optionCriteria: {units:["Pkt"]},

            displayField: "SKU", valueField: "itemID",
            pickListWidth: 400,
            pickListFields: [
                {name: "SKU"},
                {name: "itemName"},
                {name: "units"},
                {name: "category"}

            ],
            multiple: true,
            pickListProperties: {
groupByField:"category",
            }
        }
    ]
});

into here:
https://www.smartclient.com/smartcli...InlineControls

then when I select an option, close the picklist, and then open the picklist again, the original value is lost. I think it's the groupBy operation that's not preserving the value. Is there an easy way to re-set the value after the groupBy?

What I'd like is a multiple:true tree-like select item.

[Isomorphic]

We'll take a look and update here when we have more information.