Let's use a pop-up menu to add the game playing mechanics needed by a Black Jack player.
Add a Pop-up Menu part to the free-form surface. Add two Menu Choice parts to the pop-up menu part. Change the labels on the menu choices to Flip selected and Take a card. Connect the container's menu attribute to the pop-up menu's self attribute.
Switch to the Script Editor view and add the following public instance script:
flipSelected
"Flip the selected cards in the container."
(self subpartNamed: 'Container Details1')
selectedItems do: [:card |
card flip].
(self subpartNamed: 'Container Details1')
refreshItems:
(self subpartNamed: 'Container Details1') selectedItems.
Complete the part by making the following connections:
When you are done, your connections should look like this:

Save the part and close the Composition Editor for the BlackJackPlayerView part.