message: small refactorings in creator
diff: @@ -61,7 +61,7 @@ export interface IActionBarItem {
  /**
  * Toolbar item icon name
  */
  - iconName?: string;
  + iconName?: (() => string) | string;
  /**
  * Toolbar item child items. Can be used as contianer for options
  */
  @@ -88,7 +88,7 @@ export class ActionBarItem extends Base implements IActionBarItem {
  @property() active?: boolean | (() => boolean);
  @property() template?: string;
  @property() component?: string;
  - @property() iconName?: string;
  + @property() iconName?: (() => string) | string;
  @property() items?: any;
  }
  