C#

public class Airplane
{
  public Cockpit cockpit;
  public Wheel[] wheels;

  public Airplane()
  {
    cockpit=new Cockpit();
    wheels=new Wheel[] {new Wheel(), new Wheel(), new Wheel(), new Wheel()};
  }
}

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/// <summary>
/// Causes the validation events for the current focused control, without
/// it losing it.
/// </summary>
/// <remarks>Walks recursively through all the form's controls to find
/// the one that currently has the focus.</remarks>
protected void ValidateFocusedControl()
{
    foreach(Control ctl in Controls)
        if(ValidateFocusedControlRecursive(ctl))
            break;
}

/// <summary>
/// Helper function for ValidateFocusedControl.  Walks recursively the
/// children of the Control passed as a parameter.
/// </summary>
/// <param name="ctl">Control to walk its children.</param>
/// <returns>True if the focused control was found, false to keep
/// searching</returns>
/// <remarks>If the focused control is found, a new text box is created,
/// the focus set to it, and then back to focused control.</remarks>
bool ValidateFocusedControlRecursive(Control ctl)
{
    if(ctl.Focused)
    {
        if(ctl.CausesValidation)
        {
            // Make current focused control lose focus, and then get
            // it back, so we can force its validation
            TextBox txtBox = new TextBox();
            txtBox.Bounds = new Rectangle(-100, -100, 1, 1);
            txtBox.Parent = ctl.Parent;
            txtBox.Focus();
            ctl.Focus();
            txtBox.Parent = null;
            txtBox.Dispose();
        }
        return true;
    }

    // Walk children
    foreach(Control ctl2 in ctl.Controls)
        if(ValidateFocusedControlRecursive(ctl2))
            return true;

    return false;
}

toolbarButton_Click(...)<br />
{<br />
 this.toolbar1.Focus();<br />
 if(!this.toolbar1.Focused())<br />
  return;<br />
}

private void toolBar1_ButtonClick(object sender, ToolBarButtonClickEventArgs e)
{
    if(!ValidateFocusedControl())
        return;

    if(e.Button == toolBarButton1)
        MessageBox.Show(this, "Button 1 clicked!");
    else if(e.Button == toolBarButton2)
        MessageBox.Show(this, "Button 2 clicked!");
}

protected bool ValidateFocusedControl()
{
    bool result = true;

    Control ctl = ActiveControl;
    toolBar1.Focus();
    if(!toolBar1.Focused)
        result = false;
    ctl.Focus();
    return result;
}