Cannot completely disable a dimmed command button

Hi! Everyone,
I thought this topic was solved before, but it comes back to me again.
Please take a look at the code in the attached project.
If the call of "Delay(5)" is placed after "ProcessSystemEvents()" call in the A_Callback() function, B-LED always light up no matter what!?
Dimming or making button B invisible doesn't disable the command button at all.
Only when I place the "Delay(5)" call in front of the "ProcessSystemEvents()", the B button will be disabled.
Just by dimming button B, without "ProcessDrawEvents()" and "ProcessSystemEvents()", won't guarantee the button is disabled.
I'm puzzled. What is the correct way of completely disable a command button?
Does this problem only happen in CVI 6.0?
Solved!
Go to Solution.
Attachments:
DimButtons.zip ‏5 KB

Whether or not you need to call ProcessSystemEvents to ignore clicks on a button depends on what you are doing at the time and when you will undim the control. The original question came up when the button was being dimmed and undimmed in a callback.
CVI defers processing of events while you are in a callback. If you're not currently in a callback, a click event will be processed when it occurs. If the control is dimmed when that click occurs, (again, outside of a callback), the event will be processed and ignored and you don't need ProcessSystemEvents.
Or if you dim the control from within a callback, then click on the control, then exit the callback without undimming the control, the event will be processed with the control dimmed and will therefore be ignored (without needing ProcessSystemEvents).
So the big question is when will you undim the control? If you undim it at the end of a long callback, then you need to call ProcessSystemEvents.
But if, for example, you open a panel with a control dimmed, and then undim it after some other event, you don't need ProcessSystemEvents to ignore the click.
Let's say you have a panel with a control for the user to select a filename, and a button to print the selected file. You don't want Print to be active until the file is selected, so it's dimmed initially by default. In a callback for the filename control, after the user selects a file, you can then undim the Print button without needing to call ProcessSystemEvents. Any click on the previously dimmed Print button will have already been ignored.

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