@Override
	protected void dialogShown() {
		super.dialogShown();

		for (DockingActionIf action : popupActions) {
			addAction(action);
		}
	}
Return the selected version number from the history panel.
@return -1 if a version history was not selected
Ghidra/Features/Base/src/main/java/ghidra/framework/main/OpenVersionedFileDialog.java