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Create Multi COM objects

Dear All:
       Now I am working with a COM Dll, and use cvi->Tools->Create ActiveX Controller Wizard to create a .fp.
In .fp file, there is funcitons to create a new  object, and obtain a handle to the object, for example, Lib_NewInterface.
In one project, I use NewInterface to create a single object, it works well and all the funcitions in .fp file also work well.
In another project, I also use NewInterface to create several objects successfully, but only the last object works well. 
      I am jackeroo in COM Programming, so this problem puzzles me several days.
     Can anyone help me? Thanks very much
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