1.19.3 Get methods

button <-popup: create=[bool] -> popup*

Get the popup object associated with the button. If the -popup slot has value @nil and create is @on, a popup is associated with the button. This popup has one item with the following attributes:

`menu_item <-value`		<-name
`menu_item <-label`		<-label
`menu_item <-message`	message(@arg1, execute)

The message will button->execute the button when the first item is selected.

button <-selection: -> name

Equivalent to dialog_item<->label. For compatibility with older versions as well as for compatibility with other dialog_item's.