private void editButton_Click(object sender, EventArgs e)
 {
     if (dataGridViewBeliefs.SelectedRows.Count == 1)
     {
         var selectedBelief = ((ObjectView <BeliefDTO>)dataGridViewBeliefs.SelectedRows[0].DataBoundItem).Object;
         var addBeliefForm  = new AddOrEditBeliefForm(_knowledgeBaseVM, selectedBelief);
         addBeliefForm.ShowDialog();
     }
 }
        private void addBeliefButton_Click(object sender, EventArgs e)
        {
            var addBeliefForm = new AddOrEditBeliefForm(_knowledgeBaseVM);

            addBeliefForm.ShowDialog();
        }