How To Change Caption's On A Button When It Is Click ?

Good day !

Let say if I have a button with captions "OK" on it

What should I do to change to captions to others when I click on it ? Let say "KO" ?

Thanks a lot !
:)

You can either use

SetDlgItemText(YourDlgHandle,YourButtonID,"KO");

or you can get the handle of your button using GetDlgItem() and set the text with SetWindowText().