To do what you wish, you'll need to create 2 value lists, each one of only one value ( yes or no ), and to place on the layout two occurrences of the same field, each one holding a different value list.
Did you create two occurrences of that field ?
Only pressing the shift key, the user can select both options. ( and there are ways to prevent such behavior )
Yes Sir, I created two value lists, one is-"Yes", another value list field-"No"(as per your first comment).
Here the User can select both comments at a same time because it contains two value lists, isn't it..
So only I'm asking when I click the option "Yes", the second option "No" should want to lock automatically. The highlighting function is not a problem.
So please help to make lock another one while chosen one.
Two value list is OK.
Now, on your layout:
1) place a field and give it the first value list.
2) duplicate that field and change the associated value list with the second value list.
So you'll end up with a layout where there are two occurrennces of the same field.
Ok sir, Thanks for the suggestion @raybaudi..