How to show GlyphButton in FMX ListView


On Delphi 10.4.2. This is a very simple question.
A new multi-device project, Add Listview onto the form. Toggle to design mode, use DynamicAppearance.
Add 2 text items and 1 glyphButton (Checkbox),Hook up a datasource.
At design time, no checkbox showing although Glyphbotton.visible is true. At run-time, coded a ListView1ItemClick even with single line code
When click an item, it produces error as show in photo.
enter image description here
Any idea how to show the checkbox when user clicks an item. It should be a very simple function, why cannot even google an answer for this?
The sample code is on github

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