public delegate void OnIsInputKeyHandler(object sender, Keys keyData, ref bool InputKey);
public event OnIsInputKeyHandler OnIsInputKey;

private void f_in_box__control1_OnIsInputKey(object sender, System.Windows.Forms.Keys keyData, ref bool InputKey)
{
	if (keyData == System.Windows.Forms.Keys.Tab || 
		keyData == System.Windows.Forms.Keys.Enter || 
		keyData == System.Windows.Forms.Keys.Up || 
		keyData == System.Windows.Forms.Keys.Down || 
		keyData == System.Windows.Forms.Keys.Left || 
		keyData == System.Windows.Forms.Keys.Right)
		InputKey = true;
}