Property for setting combobox drop down direction

How edit a combobox class for drop down direction changing? like this

Java8 renders ALL of the UI really poorly, which is another issue entirely.
I've located the cause of my problem. When you create a ComboBox with SceneBuilder, the FXML creates this by default:
<items>
<FXCollections fx:factory="observableArrayList">
<String fx:value="Item 1" />
<String fx:value="Item 2" />
<String fx:value="Item 3" />
</FXCollections>
</items>
I'm actually loading the list via a database lookup, something like:
myCombo.setItems(myList);
The problem is that when the drop down is first rendered, it's using the string widths from the initial list of strings to calculate the drop down dimensions.
I have "solved" the problem in my app by creating the combobox in code and adding it to the scene, in which case everything works correctly. It would be nice if there was a way to tell the combobox to recalculate it's preferred sizes after a list was added/updated, but I'm unable to find a method that might do that (tried Node.autosize() without success).

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    I'm actually loading the list via a database lookup, something like:
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