Have done many changes.
Mainly on GraphAttribute.vi and WaveGraph_Facade.vi.
Now can show GraphAttribute.vi and return data to XCTL(return data not tested).
However, the cpu utilization rate is high, i do not figure why.
There is also a strange problem, after XCTL datachange event, the state value is right(such as the num of curves is 2) see from probe, but next time in datachange event, the num of curves return 0. It's so strange. I solve this problem by modify the action cluster to make "State Changed?" true, then this problem been solved, i don't know why.