A DESCRIPTION OF THE REQUEST :
When we call showDialog(ownerWindow) on a DirectoryChooser object
the dialog that shows up is not centered on the screen or centered relative to the ownerWindow.

Instead it is positioned on the upper-left corner of the ownerWindow.

The same issue applies to FileChooser dialog.

This is a platform specific issue, since under Linux/Mac it shows up centered on the screen, but not relative to the ownerWindow.



JUSTIFICATION :
Since, this ability/functionality is already implemented in javax.swing.JFileChooser, why not in JavaFX ?

EXPECTED VERSUS ACTUAL BEHAVIOR :
EXPECTED -
The dialog should show up centered relative to the ownerWindow.
ACTUAL -
The dialog shows up on the upper-left corner of the ownerWindow.

---------- BEGIN SOURCE ----------
import javafx.stage.DirectoryChooser;

DirectoryChooser dirChooser = new DirectoryChooser();
dirChooser.showDialog(ownerWindow);

---------- END SOURCE ----------