Can not add new plot name into legend of XControl Waveform Graph

[mavlc]

Hello,

I created a simple XControl which contains Waveform Graph.
When I use this XControl_Graph.xctl in Example.vi I can not add new legend item by typing its name into uninitialized legend element (see picture below).

This behavior differs from behavior with normal Waveform Graph as well as from behavior in Facade,vi of XControl_Graph.xctl.
Does anybody know why?
Second question: Is it possible to ensure that user can add new legend item of XControl_Graph.xctl in "normal way"?

Thank you very much for any help.

Best regards,

Martin

[crossrulz]

Your XCTL is technically running at this point.  It is like if you had a normal graph on a running VI.  You can't add more plots to the graph while it is running.  That is an edit-time operation.

[mavlc]

Thank you very much for your reply.

I observed that new plot can by added by clicking on the small picture in uninitialized legend element (see picture below).

Is it possible to prohibit this way of adding a new plot?
I tried to catch the Graph: Plot Attribute Change event in Facade.vi but it seems that adding new plot in this way does not fire this event.

Thanks a lot.

Martin

[eleven-ten]

Hello mavlc!

I think there is no direct method to see if you add plots, but there is a workaround that you can use. If you put in a property node of the graph and you read the value, you get it back in an Array format, there you can check the size of the array and detect if there is a change in that number.

I hope this helps with your problem.