How to put long strings in picker's items?

I'd like to add a picker control that has the long strings, but unfortunately only part of each string is displayed. How can i avoid this trouble?

<Picker x:Name="myPicker" HorizontalOptions="FillAndExpand" IsVisible="false" >
                <Picker.Items>
                    <x:String>Very long long string11111111111111111000000</x:String>
                    <x:String>Premises changed/Located in other area</x:String>
                    <x:String>Shop type change</x:String>
                    <x:String>Others</x:String>
                </Picker.Items>