Thank You for Your input.
Sorry, my poor English seems to prevent me from asking the question the right way.
It has nothing to do with the TAB Pane and its Tabs.
In forms we can move between the controls (TextField, TextArea, Combobox etx) by using the TAB-button on the keyboard.
We can change the TAB order by moving controls manually up and down in the TreeView in the Designer.
In a project I have one JavaFX control that is added via code. By design B4J place it last in the TAB order of the Form.
My question is: Can we change the TAB order of the JavaFX control in the Form?