Added react-widget missing type (containerClassName)

types/react-widgets/index.d.ts

@@ -7,6 +7,7 @@
 //                 Maxime Billemaz <https://github.com/MBillemaz>
 //                 Georg Steinmetz <https://github.com/georg94>
 //                 Troy Zarger <https://github.com/tzarger>
+//                 Siya Mzam  <https://github.com/vegtelenseg>
 // Definitions: https://github.com/DefinitelyTyped/DefinitelyTyped
 // TypeScript Version: 2.8
 

types/react-widgets/lib/DropdownList.d.ts

@@ -166,6 +166,11 @@ interface DropdownListProps extends ReactWidgetsCommonDropdownProps<DropdownList
      * when false the SelectList will render as a list of radio buttons, and checkboxes when true.
      */
     multiple?: boolean;
+
+    /**
+     * Adds a css class to the input container element.
+     */
+    containerClassName?: string;
 }
 
 interface DropdownListMessages {

types/react-widgets/react-widgets-tests.tsx

@@ -94,6 +94,9 @@ class Test extends React.Component<React.Props<{}>> {
                     name="list"
                     multiple={false}
                 />
+                <DropdownList
+                    containerClassName="list-items"
+                />
                 <Multiselect
                     autoFocus
                     allowCreate