[Tokend-Dev] How to display UI in tokend

Hi，everyone! I found that when I unlock tokend keychain in keychain access, if I input the wrong password, there's no promotion that my password is error. So I display an dialog in tokend to tell that the input password is error, but when I click the OK button, it becomes not responsive. tokend is owned by user _tokend, and keychain access is running as another user. How to solve this problem ?