title: No Delete button when editing an item in Magento Grid
body: <p>I've successfully created my first admin grid. It works fine when adding a new item. However, when I want to edit an item, strangely, the <kbd>DELETE</kbd> button is missing. Even worse, when I click the <kbd>SAVE</kbd> button, it creates a new item instead of saving the current item. What have I done wrong?</p>
  
  <p>I'm not sure what file to look at, thus I don't know which code must be posted here. If I put all the code from all files, it will be too much. Please advise.</p>
  
  <p>Update: Not sure why, but now the <kbd>SAVE</kbd> button doesn't recreate any more. So I can edit an item peacefully. However, the <kbd>DELETE</kbd> button is still missing.</p>