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Hi all, I am creating a Linear plug-in object, and trying to catch and respond to the event where a user changes the LineLength by moving one of the two built in control points of the object. However, I cannot seem to figure out what event / state change this qualifies as. The vso states I know of are: vs.kCreatedReset = 0 vs.kMovedReset = 1 vs.kRotatedReset = 2 vs.kParameterChangedReset = 3 vs.kObjectChangedReset = 4 vs.kLayerChangedReset = 5 vs.kExitFromEditGroup = 6 vs.kObjectNameChanged = 7 Below is an example of some code I have used to try to detect this state change. Alerts appear as expected for move, rotate, attribute change, and parameters changed either in the OIP or by moving an added Conrol Point parameter in the drawing, but when I drag the two points that are actually built in to the PIO, although I do receive 3 for the event, triggering the ResetEventHandler in this case, no alert fires off for any of the checked state changes. It seems that this state change is not one of those listed above. I expected it to be a Param change along with possibly a rotation and position change, depending on which of the two points was dragged. Can anyone advise on what state I need to check for, and how I can capture the new and old value for line length, rotation, and position that could have been adjusted by this action? def execute(): global objname, oh result, objname, oh, rh, wh = vs.GetCustomObjectInfo() theEvent, message = None, None theEvent, message = vs.vsoGetEventInfo() if theEvent == vs.kObjOnInitXProperties: #5 #enable eventing for this plug-in vs.SetPrefInt( vs.kParametricEnableStateEventing, 1 ) #590 result = vs.SetObjPropVS(vs.kObjXPropAcceptStates, True) #18 elif theEvent == vs.kObjOnAddState: #44 message = vs.vsoStateAddCurrent( oh, message ) elif theEvent == vs.kParametricRecalculate: #3 ResetEventHandler() def ResetEventHandler(): global objname, oh if vs.vsoStateGet( oh, vs.kCreatedReset ): vs.AlrtDialog("Object Just Created") if vs.vsoStateGet( oh, vs.kMovedReset ): vs.AlrtDialog("Object Just Moved") if vs.vsoStateGet( oh, vs.kRotatedReset ): vs.AlrtDialog("Object Just Rotated") if vs.vsoStateGet( oh, vs.kParameterChangedReset ): vs.AlrtDialog("Parameter Changed") if vs.vsoStateGet( oh, vs.kObjectChangedReset ): vs.AlrtDialog("Object Changed")