I wanna make the load button gray after user pressed the button. you know, another load process will be executed after the current one is completed, if the load button is double-clicked. Karah
"it looks not like a serious problem to me." " yes, it won't trouble you when a small target file need to be loaded, but with your application size gets larger and larger, the casual click costs too much time. Karah
"the casual click costs too much time." There must be innumerable buttons all over your Windows system that will cause trouble if you use them incorrectly! I think you just need to be more careful! Software development should be disciplined - not a "casual" activity
"Software development should be disciplined - not a "casual" activity " maybe you are right. ;-) I agree with you on this point.