How to read String control with a delay inside the Event structure

Hi friends,

I have a problem with reading the string values inside the event structure. Actually I should select the operation using combo box and then the Ok button has to press. If I select the operation and press the Ok button, It will ready the string control instantly and do further process. This results unexpected output and this shouldn't happen. There should be some delay to read the string values. During the delay time, user can enter the input they want. Can anyone solve or comment me some good idea ?????

Thanks in Advance :smileyhappy:

Note: I am using LV 8.2. So plz reply accordingly