fix issue, then it wasn't possible to remove functional blocks from
project using right click and popup menu.

The problem is that, PopupMenu was called using IDEFrame object and as
a result item in ProjectTree loosed focus and focus went to IDEFrame.
Therefore later functions couldn't detect which item in ProjectTree
was selected.

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import os

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from POULibrary import POULibrary

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class NativeLibrary(POULibrary):

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    def GetLibraryPath(self):

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        return os.path.join(os.path.split(__file__)[0], "NativeLib.xml") 

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