2. What is the correct way to bind data from your @Model to a @Composable function parameter? Here is an example:

data class VertTempControl (
    var temp : Int = 72,
    var step : Int = 1
) : Control()
...
@Model
data class DataModel (
    var username : String = "dude",
    var password : String = "blah",
    var oldPage : Pages = Pages.SPLASH_PAGE,
    var newPage : Pages = Pages.SPLASH_PAGE,
    var temperature : Int = 72
)
var dataModel = DataModel()
...
            var vt = VertTempControl(
                temp = dataModel.temperature,
                step = 1
            ) 
...
showControl (vt)

That looks fine, as long as the code from

var vt = VertTempControl

etc is inside a composable function. In that case, compose will see that you're reading a property on

dataModel

and will re-invoke your function when that property changes, which will recreate your

VertTempControl

object with the new value, pass it to

showControl

again, etc

Thanks @Zach Klippenstein (he/him)