fix bug that appears if datatype in the project tree is renamed to wrong name (keyword, existend type,...)

Traceback (most recent call last):
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_core.py", line 16765, in <lambda>
lambda event: event.callable(*event.args, **event.kw) )
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/lib/expando.py", line 126, in _adjustCtrl
numLines = self.GetNumberOfLines()
File "/usr/lib/python2.7/dist-packages/wx-3.0-gtk2/wx/_core.py", line 16710, in __getattr__
raise PyDeadObjectError(self.attrStr % self._name)
PyDeadObjectError: The C++ part of the TreeTextCtrl object has been deleted, attribute access no longer allowed.

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int CheckRetainBuffer(void)

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{

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	return 1;

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}

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void ValidateRetainBuffer(void)

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{

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}

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void InValidateRetainBuffer(void)

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{

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}

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void Retain(unsigned int offset, unsigned int count, void *p)

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{

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}

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void Remind(unsigned int offset, unsigned int count, void *p)

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{

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}