/// <summary>
/// Check whether the given hotkey combination exists or not.
/// </summary>
/// <param name="hk"></param>
/// <returns></returns>
public bool Exist(HotKey hk)
{
return(Find(hk) != null);
}
/// <summary>
/// Find matched key in the existing list
/// </summary>
/// <param name="hk"></param>
/// <returns></returns>
private HotKey Find(HotKey hk)
{
return((from k in this.HotKeyList
where k.Key == hk.Key && k.Modifier == hk.Modifier
select k).FirstOrDefault());
}