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Hi, i'm new to tornadofx and javafx in general, how can i put data inside this tableview without having to create a custom object the data i want to put inside is a Double.

hello. you have to bind list property with data to show to tableview, e.g. in tornadofx:
```tableview(list) {
}```
where list is ObservableList (or ReadOnlyListProperty, or ObservableValue&lt;out ObservableList&lt;T&gt;&gt;)

next you have to configure columns and bind records properties to cells values.

```tableview(rooms) {
    column("#", Room::id)
    column("Number", Room::number)
    column("Type", Room::type)
    column("Bed", Room::bed)
}```
for more info see <https://edvin.gitbooks.io/tornadofx-guide/content/part1/5_Data_Controls.html>

additionally you can use
```setCellValueFactory {  }```
or
```cellFormat {  }```
in column definition to customize cell representation