BUG: Tiled Group Views not properly reporting status

isValid was only looking at children views in Tabs.  Also need to properly connect a childView's
modified signal to the view's childModified slot for tiled and box styles.

There was also an issue with qtAttribteView returning an incorrect not valid when the underlying
association widget is hidden (cause there are no attributes in the list) but its marked as invalid
cause that was status based on the last attribute deleted.

smtk/extension/qt/qtAttributeView.cxx

@@ -1458,7 +1458,7 @@ bool qtAttributeView::isValid() const
       return false;
     }
   }
-  if (m_internals->AssociationsWidget != nullptr)
+  if ((m_internals->AssociationsWidget != nullptr) && m_internals->AssociationsWidget->isVisible())
   {
     return m_internals->AssociationsWidget->isValid();
   }

smtk/extension/qt/qtGroupView.cxx

@@ -341,7 +341,21 @@ qtBaseView* qtGroupView::getChildView(int pageIndex)
 
 bool qtGroupView::isValid() const
 {
-  foreach (qtBaseView* childView, m_internals->m_TabbedViews)
+  // If the view is tabbed lets look at the tabbed views which
+  // is a subset of the children views which are visible tabs
+  // else we need to examine the children views
+  if (m_internals->m_style == qtGroupViewInternals::TABBED)
+  {
+    foreach (qtBaseView* childView, m_internals->m_TabbedViews)
+    {
+      if (!childView->isValid())
+      {
+        return false;
+      }
+    }
+    return true;
+  }
+  foreach (qtBaseView* childView, m_internals->m_ChildViews)
   {
     if (!childView->isValid())
     {
@@ -534,6 +548,7 @@ void qtGroupView::addGroupBoxEntry(qtBaseView* child)
   {
     return;
   }
+  QObject::connect(child, &qtBaseView::modified, this, &qtGroupView::childModified);
   smtk::extension::qtCollapsibleGroupWidget* gw = new qtCollapsibleGroupWidget(frame);
   this->Widget->layout()->addWidget(gw);
   gw->setName(child->getObject()->label().c_str());
@@ -548,6 +563,7 @@ void qtGroupView::addTileEntry(qtBaseView* child)
   {
     return;
   }
+  QObject::connect(child, &qtBaseView::modified, this, &qtGroupView::childModified);
   QLabel* label = new QLabel(child->getObject()->label().c_str(), this->Widget);
   m_internals->m_Labels.append(label);
   QFont titleFont;