Message: This layer contains objects, are you sure you want to delete them
Cause
You have tried to delete a layer which contains objects.
What Can I Do?
 Click 
 the Delete Layer button to remove 
 the layer and the objects in it from the document.
 Click 
 the Delete Layer button to remove 
 the layer and the objects in it from the document.
 Click the Cancel 
 button if you do not want to delete the layer.
 Click the Cancel 
 button if you do not want to delete the layer.