code: function (iIndex) {
  			this.setProperty("buttons", this.getProperty("buttons").splice(iIndex, 1));
  			this.getFlexbox(true).removeItem(iIndex);
  			return this.getFlexbox(false).removeItem(iIndex);
  		}
docs: Removes a button from the ContextMenu.
  @param {int} iIndex the button to remove or its index or id
  @return {sap.m.OverflowToolbarButton} The removed button or null
  @public