Clear chart in subvi from the main vi

Hi all,
im not sure if this has been solved before but my problem is, is there a easier method if i create a subvi containing a waveform chart and i want to clear the data in the chart after each run so that new values from the main vi can be plotted without the previous data plot. I placed the "history data" property node and wired it to an empty array in the subvi but when i ran the program, the graph doesnt plot at all..
Regards
Adrian

hmm ii'll try using the invoke property method.
Appreciate and thanks for the help guys!
Attachments:
Computerscreen.vi ‏18 KB
trialanderror2.vi ‏35 KB

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