makes TextBox use BaseClass on event

src/TextBox.js

@@ -407,16 +407,6 @@ function(d, i) {
     return arguments.length ? (this._lineHeight = typeof _ === "function" ? _ : constant(_), this) : this._lineHeight;
   }
 
-  /**
-      @memberof TextBox
-      @desc Adds or removes a *listener* to each box for the specified event *typenames*. If a *listener* is not specified, returns the currently-assigned listener for the specified event *typename*. Mirrors the core [d3-selection](https://github.com/d3/d3-selection#selection_on) behavior.
-      @param {String} [*typenames*]
-      @param {Function} [*listener*]
-  */
-  on(typenames, listener) {
-    return arguments.length === 2 ? (this._on[typenames] = listener, this) : arguments.length ? this._on[typenames] : this._on;
-  }
-
   /**
       @memberof TextBox
       @desc If *value* is specified, sets the overflow accessor to the specified function or boolean and returns this generator. If *value* is not specified, returns the current overflow accessor.