add findElement

Author: fartinmartin

shared/ScriptUI.d.ts

@@ -2697,6 +2697,11 @@ declare class _Control {
    */
   dispatchEvent(): Event
 
+  /**
+   * Searches for the named element among the children of this window or container, and returns the object if found.
+   */
+  findElement(name: string): _Control | null
+
   /**
    * Hides this element.
    */