@@ -, +, @@ 
- fix palette menu
--- a/form.nb/src/org/netbeans/modules/nbform/actions/InstallToPaletteAction.java	
+++ a/form.nb/src/org/netbeans/modules/nbform/actions/InstallToPaletteAction.java	
@@ -94,6 +94,9 @@ 
 
     @Override
     protected boolean enable(Node[] activatedNodes) {
+        if (activatedNodes.length == 0) {
+            return false;
+        }
         for (Node n: activatedNodes) {
             FileObject fobj = n.getLookup().lookup(FileObject.class);
             if (fobj == null || JavaSource.forFileObject(fobj) == null) {