private void btnAddVariable_Click(object sender, EventArgs e)
        {
            ChooseVariable frmVariable = new ChooseVariable();

            if (frmVariable.ShowDialog() == System.Windows.Forms.DialogResult.OK)
            {
                _table.Variables.Add(frmVariable.SelectedVariable);
                lbVariables.SelectedItem           = frmVariable.SelectedVariable;
                pxVariableBindingSource.DataSource = frmVariable.SelectedVariable;
            }
        }
 private void btnAddVariable_Click(object sender, EventArgs e)
 {
     ChooseVariable frmVariable = new ChooseVariable();
     if (frmVariable.ShowDialog() == System.Windows.Forms.DialogResult.OK)
     {
         _table.Variables.Add(frmVariable.SelectedVariable);
         lbVariables.SelectedItem = frmVariable.SelectedVariable;
         pxVariableBindingSource.DataSource = frmVariable.SelectedVariable;
     }
 }