docs: function(model) {
  			var rowDiv = this.getRowDiv(model);
  			if (this.isExpandable(model) && this.isExpanded(model)) {
  				this._modelIterator.collapse(model);
  				this.explorer.myTree.toggle(rowDiv.id); // collapse tree visually
  			}
  			rowDiv.classList.remove("checkedRow"); //$NON-NLS-0$
  			rowDiv.classList.add("disabledNavRow"); //$NON-NLS-0$
  			this.setIsNotSelectable(model, true);
  		}