>I have a form containing several controls. One of them is an "Apply" button. This is initially disabled. I want a change in the settings in any of the other controls on the form to cause the button to be enabled. Is there any way to automate this (e.g. is a form property changed when any one of its contained objects is changed)?
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>Many thanks.

In addition to other reply you may introduce a From property and give it Assign method. Then in this method you may enable your Apply button.