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When designing a Validation Form in KTM 4.5 and earlier, there is nothing to stop you from dragging buttons and fields off of the screen to the top and the left at which point they still exist but are completely inaccessible. You could also resize these controls to have zero height or width, also making them completely inaccessible.

This utility finds and restores controls lost in this way. The underlying behavior was fixed in KTM 5.0