List Ids in Use (Panel Edit)
This function displays a dialog that shows all of the IDs between 0 and 1000. Any ID currently in use is shown as highlighted. This allows you to find unused ID numbers which can be assigned to controls which have a duplicate ID number.
To list all of the IDs used by an editor:
List IDs in Use Dialog
This dialog shows which ID numbers are currently used and which are not.
Used IDs include the X,Y position where the control is located and the layer that it is located on.