>>>The error occurs when AddProperty() is called, since it's a new property I am adding and since I pass in the value, there should be no possibility of a data type mismatch, but that is what I get.
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>>Yes, I was just thinking about it. I got some weird effects with controls inside the grid long time ago. Is there any way to avoid using AddProperty in your case?
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>>BTW, do you have Access or Assign method for Width in some of your controls?
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>But wouldn't the error (of assigning a date to .width, for example) happen in these methods, and not on the addproperty line?
>Still, you may be into something there. The addproperty() takes arbitrary values, you can assign anything to a property UNLESS it's a built-in property with a specified type and range. Now if it was out of range we'd have a different value. Since Gary has already checked for the .width (being a number), then the remaining thing is to see whether the target property is perhaps defined somewhere as of a different type.
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>Like I said in the other message, the crucial test would be to rename the property, or at least to try to assign the .width to a property of a different name first.

Yes, trying to use a different name for the property sounds like an idea to try. On the other hand, nOriginalWidth sounds like a very good name already, can you think of something else?