private void toolBar1_ButtonClick(object sender, System.Windows.Forms.ToolBarButtonClickEventArgs e)
{
// the toolbar doesn't get the focus when clicked, so
// the grid could still be in edit mode...
_flex.FinishEditing();
// the grid still has the focus and the cursor hasn't moved to a new row,
// so the data source still doesn't see the row as changed.
// so we use the currency manager to end the edits.
CurrencyManager cm = (CurrencyManager)BindingContext[_flex.DataSource, _flex.DataMember];
cm.EndCurrentEdit();
// proceed as usual
button1_Click(sender, EventArgs.Empty);
}