Plot xy graph in specific zone

Hi!
I'm having a problem with my XY Graph.
I collect data and show it on the graph where x-axis is between 0 and 100 for example.
Then I have a button that will collect data again but just between 40 and 60 on the x-axis, so what I want to do is:
- After I click the button, The plot between 0 and 39 and the plot between 61 and 100 will remain in the graph and the new data will replace the one that was on the 40 to 60 in x-axis.
How can I do this??? Maybe with two plots???
Any help would be great.
Thanks

EDIT: Solved

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State: HY000. Code: 10058. [NQODBC] [SQL_STATE: HY000] [nQSError: 10058] A general error has occurred. [nQSError: 17001] Oracle Error code: 937, message: ORA-00937: not a single-group group function at OCI call OCIStmtExecute. [nQSError: 17010] SQL statement preparation failed. (HY000)
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Attachments:
two graphs.JPG ‏26 KB

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Plot xy graph

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Plot xy graph in specific zone

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