title: How to remove delete icon in one2many tree view
body: <p>Please advice me on this.need to remove delete icon.but need to create and edit records.
  if i set it as readonly then unable to edit also.so what is the better way to implement this </p>
  
  <p><img src="https://i.stack.imgur.com/2O2e3.png" alt="delete icon"></p>