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The select button can be hidden from the ribbon/toolbar or shown again programatically through the hideItem / showItem CLAPI methods, or disabled/enabled using disableItem / enableItem. Hiding and disabling the select button's options can be done through the hideSubitem / disableSubitem CLAPI methods.
hideSubitem(itemName, subitemName)
showSubitem(itemName, subitemName)
disableSubitem(itemName, subitemName)
enableSubitem(itemName, subitemName)
itemName and subitemName are the values added in the “Menu structure code“, when creating the select button and its children