C# Databound Windows Forms control does not retain value unless you leave the field

I saw the answer in Databound Windows Forms control does not recognize change until losing focus.

But this doesn't fully answer the question for me. I have the exact same situation. On ToolStrip_click, I go through all of my controls and I force "WriteValue()", but it still reverts to the previous value before the save. Can anyone suggest how I can fix this? Did I implement this incorrectly?

(See code for current (non-working) solution.)

private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
    // Make sure that all items have updated databindings.
    foreach (Control C in this.Controls)
    {
        foreach (Binding b in C.DataBindings)
        {
            // Help: this doesn't seem to be working.
            b.WriteValue();
        }
    }
}

The code is now much simpler, but it is a considerable hack. I'd be very happy to know if there is a more "proper" fix for this.

private void menuStrip1_ItemClicked(object sender, ToolStripItemClickedEventArgs e)
{
    // Make sure that all text fields have updated by forcing everything
    // to lose focus except this lonely little label.
    label44.Focus();
}