Set SubTaskPane dialog to appear in middle
Focus SubTaskPane when init
Add owner field to set location of dialog
Set owner before getting details dialog
Remove "owner" as field in details pane
Add "owner" argument in showDetailsPane to set location
Revert "Add "owner" argument in showDetailsPane to set location"

This reverts commit 28202e126430847f6672df0595b2ec0b0967e807.
Add "owner" argument in showDetailsPane() and show()
Adopt to new show() and showDetailsPane()
Call DetailsPane.show() with owner to set location
Show dialog with relative to their parent

Merge branch 'show-dialogs-in-center' into develop