objects can now be added on the right side if its an uppernode

src/ui/view/GUI.java

@@ -100,6 +100,7 @@ public class GUI<E> implements CategoryListener {
 
 	private final SimulationMenu simMenu;
 
+	private JTabbedPane tabTemp; //tabbedPane or tabbedPane2
 	private final JMenuBar menuBar = new JMenuBar();
 	private final JMenu mnNewMenu = new JMenu("File");
 	private final JMenu mnNewMenuEdit = new JMenu("Edit");
@@ -1273,9 +1274,14 @@ public class GUI<E> implements CategoryListener {
 			public void mouseReleased(MouseEvent e) {
 				try {
 					if (dragging) {
-						if (((JScrollPane) tabbedPane.getSelectedComponent()).getViewport()
+						if (tabbedPane.getMousePosition() != null) {
+							tabTemp = tabbedPane;
+						} else {
+							tabTemp = tabbedPane2;
+						}
+						if (((JScrollPane) tabTemp.getSelectedComponent()).getViewport()
 								.getComponent(0) instanceof UpperNodeCanvas) {
-							UpperNodeCanvas unc = ((UpperNodeCanvas) ((JScrollPane) tabbedPane.getSelectedComponent())
+							UpperNodeCanvas unc = ((UpperNodeCanvas) ((JScrollPane) tabTemp.getSelectedComponent())
 									.getViewport().getComponent(0));
 
 							int x = (int) unc.getMousePosition().getX();
@@ -2102,7 +2108,6 @@ public class GUI<E> implements CategoryListener {
 	 */
 	private void openNewUpperNodeTab() {
 		// is the uppernode on tabbedPane or tabbedPane2
-		JTabbedPane tabTemp;
 		if (tabbedPane.getMousePosition() != null) {
 			tabTemp = tabbedPane;
 		} else {
@@ -2143,7 +2148,6 @@ public class GUI<E> implements CategoryListener {
 					unitGraph.empty();
 					holonEleNamesDisplayed = Languages.getLanguage()[25];
 					elementGraph.setText(holonEleNamesDisplayed);
-					JTabbedPane tabTemp;
 					if (tabbedPane.getMousePosition() != null) {
 						tabTemp = tabbedPane;
 					} else {