diff -r b8588e318001 -r 8ddf4af937d7 src/de/uapcore/sudoku/ActionHandler.java
--- a/src/de/uapcore/sudoku/ActionHandler.java	Sat Jan 26 18:43:49 2013 +0100
+++ b/src/de/uapcore/sudoku/ActionHandler.java	Sat Jan 26 19:34:31 2013 +0100
@@ -48,13 +48,25 @@
     
     private Field field;
     private Solver solver;
+    private DocumentHandler doc;
     
     public ActionHandler(Field f) {
         field = f;
         solver = new Solver();
+        doc = new DocumentHandler();
+    }
+    
+    private boolean chooseSaveFilename() {
+        // TODO: fileselector
+        return false;
     }
     
     private boolean save() {
+        if (!doc.isFilenameSet()) {
+            if (!chooseSaveFilename()) {
+                return false;
+            }
+        }
         if (solver.check(field)) {
             field.setAllCellsModified(false);
             // TODO: save to file