Minor windowing changes.

Clocker/Panel/ParentPanelController.swift

@@ -38,7 +38,10 @@ class ParentPanelController: NSWindowController {
 
     private var note: NotesPopover?
 
-    private lazy var oneWindow = OneWindowController.shared()
+    private lazy var oneWindow: OneWindowController? = {
+        let preferencesStoryboard = NSStoryboard(name: "Preferences", bundle: nil)
+        return preferencesStoryboard.instantiateInitialController() as? OneWindowController
+    }()
 
     @IBOutlet var mainTableView: PanelTableView!
 
@@ -625,7 +628,7 @@ class ParentPanelController: NSWindowController {
     }
 
     private func openPreferences() {
-        oneWindow.showWindow(nil)
+        oneWindow?.showWindow(nil)
         NSApp.activate(ignoringOtherApps: true)
     }
 
@@ -653,7 +656,7 @@ class ParentPanelController: NSWindowController {
     }
 
     private func showPermissionsWindow() {
-        oneWindow.openPermissions()
+        oneWindow?.openPermissions()
         NSApp.activate(ignoringOtherApps: true)
     }
 

Clocker/Preferences/Calendar/CalendarViewController.swift

@@ -136,8 +136,7 @@ class CalendarViewController: ParentViewController {
 
     @IBAction func grantAccess(_: Any) {
         if grantAccessButton.title == "Grant Access".localized() {
-            OneWindowController.shared().openPermissions()
-            NSApp.activate(ignoringOtherApps: true)
+            (parent as? CenteredTabViewController)?.selectedTabViewItemIndex = 3 // 3 is the Permissions View
         } else if grantAccessButton.title == "Launch Preferences" {
             NSWorkspace.shared.launchApplication("System Preferences")
         }