initialize action as checkbutton
diff --git a/core/plugins/org.eclipse.dltk.testing/src/org/eclipse/dltk/internal/testing/ui/EnableStackFilterAction.java b/core/plugins/org.eclipse.dltk.testing/src/org/eclipse/dltk/internal/testing/ui/EnableStackFilterAction.java
index 8636039..827ec9b 100755
--- a/core/plugins/org.eclipse.dltk.testing/src/org/eclipse/dltk/internal/testing/ui/EnableStackFilterAction.java
+++ b/core/plugins/org.eclipse.dltk.testing/src/org/eclipse/dltk/internal/testing/ui/EnableStackFilterAction.java
@@ -36,6 +36,7 @@
 		PlatformUI.getWorkbench().getHelpSystem().setHelp(this, IDLTKTestingHelpContextIds.ENABLEFILTER_ACTION);
 
 		fView= view;
+		setChecked(false);
 		setEnabled(false);
 	}