Delete DPGI's when parent DPG deleted

Ensure Gui/QGIVxx is removed when App/DVxxxx is deleted

src/Mod/TechDraw/App/DrawViewCollection.cpp

@@ -26,6 +26,8 @@
 # include <sstream>
 #endif
 
+#include <App/Document.h>
+
 #include <Base/Console.h>
 #include <Base/Exception.h>
 
@@ -42,6 +44,7 @@ PROPERTY_SOURCE(TechDraw::DrawViewCollection, TechDraw::DrawView)
 
 DrawViewCollection::DrawViewCollection()
 {
+    nowDeleting = false;
     static const char *group = "Drawing view";
     ADD_PROPERTY_TYPE(Source    ,(0), group, App::Prop_None,"Shape to view");
     ADD_PROPERTY_TYPE(Views     ,(0), group, App::Prop_None,"Attached Views");
@@ -165,6 +168,26 @@ void DrawViewCollection::onChanged(const App::Property* prop)
     TechDraw::DrawView::onChanged(prop);
 }
 
+void DrawViewCollection::unsetupObject()
+{
+    nowDeleting = true;
+
+    // Remove the collection's views from document
+    App::Document* doc = getDocument();
+    std::string docName = doc->getName();
+
+    const std::vector<App::DocumentObject*> currViews = Views.getValues();
+    std::vector<App::DocumentObject*> emptyViews;
+    std::vector<App::DocumentObject*>::const_iterator it = currViews.begin();
+    for (; it != currViews.end(); it++) {
+        std::string viewName = (*it)->getNameInDocument();
+        Base::Interpreter().runStringArg("App.getDocument(\"%s\").removeObject(\"%s\")",
+                                          docName.c_str(), viewName.c_str());
+    }
+    Views.setValues(emptyViews);
+}
+
+
 App::DocumentObjectExecReturn *DrawViewCollection::execute(void)
 {
     if (ScaleType.isValue("Page")) {