/// <summary>removes a control from the table and returns true on success</summary>
/// <param name = "ctrl">the control to remove</param>
internal bool Remove(MgControlBase ctrl)
{
_controls.Remove(ctrl);
return(_controls.Contains(ctrl));
}
/// <summary>
/// removes a task from the table
/// </summary>
/// <param name = "task">a reference to the task to remove </param>
internal void removeTask(Task task)
{
_tasks.Remove(task);
}