[571221] Show instance tab inside untyped subapps

When the background (i.e., nothing) is selected inside of untyped
subapps in edition to the interface editing tabs then instance tab is
shown.

Bug: https://bugs.eclipse.org/bugs/show_bug.cgi?id=571221
Change-Id: I03ef2fe18194e0e3547c745f67da204877d6687d
Signed-off-by: Alois Zoitl <alois.zoitl@gmx.at>
diff --git a/plugins/org.eclipse.fordiac.ide.application/plugin.xml b/plugins/org.eclipse.fordiac.ide.application/plugin.xml
index c657162..d4bb31c 100644
--- a/plugins/org.eclipse.fordiac.ide.application/plugin.xml
+++ b/plugins/org.eclipse.fordiac.ide.application/plugin.xml
@@ -181,6 +181,9 @@
             <input
                   type="org.eclipse.fordiac.ide.model.libraryElement.FBNetworkElement">
             </input>
+            <input
+                  type="org.eclipse.fordiac.ide.application.editparts.UISubAppNetworkEditPart">
+            </input>
          </propertySection>
          <propertySection
          	class="org.eclipse.fordiac.ide.application.properties.DemultiplexerSection"
diff --git a/plugins/org.eclipse.fordiac.ide.application/src/org/eclipse/fordiac/ide/application/properties/InterfaceSection.java b/plugins/org.eclipse.fordiac.ide.application/src/org/eclipse/fordiac/ide/application/properties/InterfaceSection.java
index 5820d0a..cce56b3 100644
--- a/plugins/org.eclipse.fordiac.ide.application/src/org/eclipse/fordiac/ide/application/properties/InterfaceSection.java
+++ b/plugins/org.eclipse.fordiac.ide.application/src/org/eclipse/fordiac/ide/application/properties/InterfaceSection.java
@@ -16,17 +16,24 @@
  *******************************************************************************/
 package org.eclipse.fordiac.ide.application.properties;
 
-import org.eclipse.fordiac.ide.application.editparts.AbstractFBNElementEditPart;
 import org.eclipse.fordiac.ide.gef.properties.AbstractInterfaceSection;
+import org.eclipse.fordiac.ide.model.libraryElement.FBNetwork;
 import org.eclipse.fordiac.ide.model.libraryElement.FBNetworkElement;
+import org.eclipse.gef.EditPart;
 
 public class InterfaceSection extends AbstractInterfaceSection {
 
 	@Override
 	protected FBNetworkElement getInputType(Object input) {
-		if (input instanceof AbstractFBNElementEditPart) {
-			return ((AbstractFBNElementEditPart) input).getModel();
-		} else if (input instanceof FBNetworkElement) {
+		if (input instanceof EditPart) {
+			input = ((EditPart) input).getModel();
+		}
+
+		if (input instanceof FBNetwork) {
+			input = ((FBNetwork) input).eContainer();
+		}
+
+		if (input instanceof FBNetworkElement) {
 			return (FBNetworkElement) input;
 		}
 		return null;