/// <summary>
/// Remove old tool (if present) and activate new. If <paramref name="tool"/> is null
/// the current active tool is removed.
/// </summary>
/// <typeparam name="T">Type of the tool passed to this method.</typeparam>
/// <param name="tool">New top level tool to activate - null is equal to RemoveActiveTool.</param>
/// <returns>The new tool.</returns>
public static T ActivateTool <T>(Tool tool) where T : Tool
{
return(ActivateTool(tool) as T);
}
