/// <summary>
/// Search from root tool, through all children (depth first),
/// for a frame tool operating on <paramref name="frame"/>.
/// </summary>
/// <param name="frame">Frame to search frame tool for.</param>
/// <returns>First frame tool that matches <paramref name="frame"/>.</returns>
public static FrameTool FindActive(IFrame frame)
{
return(ToolManager.FindActive <FrameTool>(frameTool => frameTool.Frame == frame));
}