extjs 6 modern combobox with infinite scrolling

Question

Based on this comment from mitchellsimoens at sencha forums i tried to implement an infinite scrolling combobox in extjs 6.5.2 modern.

The thing is that setting the combobox store to a virtual store produces this error: Uncaught TypeError: a.setExtraKeys is not a function.

I also set the floatedPicker to:

{
xtype: 'boundlist',
infinite: true,
// BoundListNavigationModel binds to input field
// Must only be enabled when list is visible
navigationModel: {
    disabled: true
},
scrollToTopOnRefresh: false,
loadingHeight: 70,
maxHeight: 300,
floated: true,
axisLock: true,
hideAnimation: null
}

Is there a way to implement an infinite scrolling combobox in extjs 6 modern without changing the default picker to a grid?

Answer 1

OK this actually works:

floatedPicker: {
            xtype: 'boundlist',
            infinite: true,
            // BoundListNavigationModel binds to input field
            // Must only be enabled when list is visible
            navigationModel: {
                disabled: true
            },
            plugins: {
                listpaging: {
                    autoPaging: true,
                    loadMoreText: 'More records..',
                    noMoreRecordsText: 'No more records.'
                }
            },
            scrollToTopOnRefresh: false,
            loadingHeight: 70,
            maxHeight: 300,
            floated: true,
            axisLock: true,
            hideAnimation: null,
            variableHeights: true
        }

It's a bit ugly when loading but it works.

Also i used an Ext.data.store. Virtual store don't work with comboboxes.