Object currDeclaration = k.next();
if (currDeclaration instanceof MethodDeclaration) {
// Make return type void
MethodDeclaration aMethod = (MethodDeclaration) currDeclaration;
aMethod.setReturnType2(ast.newPrimitiveType(PrimitiveType.VOID));
// Add AsyncCallback parameter
SingleVariableDeclaration asyncCallbackParam = ast.newSingleVariableDeclaration();
asyncCallbackParam.setName(ast.newSimpleName("callback")); //$NON-NLS-1$
asyncCallbackParam.setType(ast.newSimpleType(ast.newName("AsyncCallback"))); //$NON-NLS-1$