private void DeleteDefinition_Click(object sender, RoutedEventArgs e)
{
if (DefinitionsDataGrid.IsSingleRowSelected())
{
Definition selectedDefinition = _definitions[DefinitionsDataGrid.SelectedIndex];
_SQLClient.DeleteDefinition(selectedDefinition.ClassConceptId, selectedDefinition.SourceId);
SelectConceptDefinitions(selectedDefinition.ClassConceptId);
}
}