control lost focus event when using keyboard shortcut

public partial class Form1 : Form
    {
        private Boolean _didLostFocusLogic;

        public Form1()
        {
            InitializeComponent();
        }

        private void textBox1_Leave(object sender, EventArgs e)
        {
            LostFocusLogic();
        }

        private void button1_Click(object sender, EventArgs e)
        {
            ButtonClickLogic();
        }

        private void LostFocusLogic()
        {
            /* Do stuff */
            _didLostFocusLogic = true;
        }

        private void ButtonClickLogic()
        {
            if (!_didLostFocusLogic)
                LostFocusLogic();

            _didLostFocusLogic = false; // Reset for next time.

            /* Do stuff */
        }
    }

Button b = (Button) sender;
b.Focus();