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preset selected values for lightning:dualListbox

How can I get lightning:dualListbox to show preselected list of values? I've tried what I've seen on developer's blogs but for some reason my right list is always empty. (API v.43)
​<aura:attribute name="countryOptions" type="List" default="[
                                                               { label: 'United Kingdom', value: 'GB' },
                                                               { label: 'Netherlands', value: 'NL' }]"/>

<aura:attribute name="existingValues" type="List" default="[ {label: 'United Kingdom', value: 'GB' }]" />

<lightning:dualListbox  label= "Select Country"  sourceLabel="Available"  selectedLabel="Selected" 

Hemendra Malik 16Hemendra Malik 16
In value it accepts list of string. Please define attribute as - 
<aura:attribute name="existingValues" type="List" default="['United Kingdom','GB' ]" />

now this should work fine..