JavaScriptAction javascipt_action = new JavaScriptAction(Action.create(form.getDocument(),

Action.e_TypeJavaScript));

javascipt_action.setScript("var ann = this.getAnnot(0, \" UniqueID \"); if (ann != null) { ann.destroy(); } ");

AdditionalAction aa = new AdditionalAction(field);

aa.setAction(AdditionalAction.e_TriggerAnnotCursorEnter, javascipt_action);

aa.doJSAction(AdditionalAction.e_TriggerAnnotCursorEnter);