Adding definition for InputGroup.Button

src/DropdownButton.d.ts

@@ -7,6 +7,7 @@ export interface DropdownButtonProps extends React.Props<DropdownButtonClass> {
   bsStyle?: string;
   bsSize?: string;
   buttonClassName?: string;
+  componentClass?: any;
   className?: string;
   dropup?: boolean;
   href?: string;

src/InputGroup.d.ts

@@ -1,6 +1,7 @@
 // Import React
 import React = require("react");
 import { InputGroupAddonClass } from './InputGroupAddon';
+import { InputGroupButtonClass } from './InputGroupButton';
 
 // <InputGroup />
 // ----------------------------------------
@@ -10,5 +11,6 @@ export interface InputGroupProps extends React.Props<InputGroupClass> {
 export interface InputGroup extends React.ReactElement<InputGroupProps> {}
 export interface InputGroupClass extends React.ComponentClass<InputGroupProps> {
   Addon: InputGroupAddonClass;
+  Button: InputGroupButtonClass;
 }
 export var InputGroup:InputGroupClass;

src/InputGroupButton.d.ts

@@ -0,0 +1,10 @@
+// Import React
+import React = require("react");
+
+// <InputGroup.Button />
+export interface InputGroupButtonProps extends React.Props<InputGroupButtonClass> {
+
+}
+export interface InputGroupButton extends React.ReactElement<InputGroupButtonProps> {}
+export interface InputGroupButtonClass extends React.ComponentClass<InputGroupButtonProps> {}
+export var InputGroupButton:InputGroupButtonClass;