private void addVendorButton_Click(object sender, EventArgs e)
 {
     using (var dialog = new AddItemDialog())
     {
         if (dialog.ShowDialog(this) == DialogResult.OK)
         {
             _vendorComboBox.Items.Add(dialog.ItemName);
         }
     }
 }
 private void addTypeButton_Click(object sender, EventArgs e)
 {
     using (var dialog = new AddItemDialog())
     {
         if (dialog.ShowDialog(this) == DialogResult.OK)
         {
             _typeComboBox.Items.Add(dialog.ItemName);
         }
     }
 }
 private void addTagButton_Click(object sender, EventArgs e)
 {
     using (var dialog = new AddItemDialog())
     {
         if (dialog.ShowDialog(this) == DialogResult.OK)
         {
             _tagsCLB.Items.Add(dialog.ItemName);
         }
     }
 }