properly display MyFeed dialog

gui/griffon-app/controllers/com/muwire/gui/MainFrameController.groovy

@@ -377,7 +377,7 @@ class MainFrameController {
     void showMyFeed() {
         def params = [:]
         params['core'] = model.core
-        mvcGroup.createMVCGroup("my-feed", params)
+        mvcGroup.createMVCGroup("my-feed", params).destroy()
     }
 
     @ControllerAction

gui/griffon-app/controllers/com/muwire/gui/MyFeedController.groovy

@@ -33,6 +33,5 @@ class MyFeedController {
     @ControllerAction
     void close() {
         view.dialog.setVisible(false)
-        mvcGroup.destroy()
     }
 }

gui/griffon-app/views/com/muwire/gui/MyFeedView.groovy

@@ -126,11 +126,6 @@ class MyFeedView {
             pack()
             setLocationRelativeTo(mainFrame)
             setDefaultCloseOperation(JDialog.DISPOSE_ON_CLOSE)
-            addWindowListener(new WindowAdapter() {
-                public void windowClosed(WindowEvent e) {
-                    mvcGroup.destroy()
-                }
-            })
             show()
         }
     }