- // shouldn't be called twice unless we are resetting the line
- wxASSERT( m_pLine == 0 || pLine == 0 );
+ // for a normal (i.e. not root) group this method shouldn't be called twice
+ // unless we are resetting the line
+ wxASSERT_MSG( !m_pParent || !m_pLine || !pLine,
+ _T("changing line for a non-root group?") );
+