setGenericContextButtons(data, pe, CONTEXT_BUTTON_DELETE |
		CONTEXT_BUTTON_UPDATE);

 public class MyFeatureProvider extends DefaultFeatureProvider {
   ...
   	@Override
	public IRemoveFeature getRemoveFeature(IRemoveContext context) {
		return null; // remove disabled for the UI  
	}
	
	protected IRemoveFeature getRemoveFeatureEnabled(IRemoveContext context) {
		return super.getRemoveFeature(context); // used where we enable remove (deleting...) 
	}

	@Override
	public IDeleteFeature getDeleteFeature(IDeleteContext context) {
		return new MyDeleteFeature(this);
	}
   }

  public class MyFeatureProviderWithRemove extends MyFeatureProvider {

	public MyFeatureProviderWithRemove(IDiagramTypeProvider dtp) {
		super(dtp);
	}

	@Override
	public IRemoveFeature getRemoveFeature(IRemoveContext context) {
		return super.getRemoveFeatureEnabled(context);  
	}	
   }
   
   public class MyDeleteFeature extends DefaultDeleteFeature {

	public MyDeleteFeature(IFeatureProvider fp) {
		super(new MyFeatureProviderWithRemove(fp.getDiagramTypeProvider()));
	}

   }

public class MyFeatureProvider extends DefaultFeatureProvider {
...

@Override
    public IRemoveFeature getRemoveFeature(IRemoveContext context) {
        /**
         * return <code>NULL</code> will disable Remove action but at the same time disable Delete action, because delete uses remove.
         */
        return new DefaultRemoveFeature(this) {
            
            /* 
             * (non-Javadoc)
             * @see org.eclipse.graphiti.features.impl.AbstractFeature#isAvailable(org.eclipse.graphiti.features.context.IContext)
             */
            @Override
            public boolean isAvailable(IContext context) {
                return false;
            }
        };
    }
}