/// <summary>
/// Notification that the size of the control has changed.
/// </summary>
/// <param name="tc">Reference to owning TreeControl.</param>
public override void SizeChanged(TreeControl tc)
{
// Are we requested to allocate spare space?
if (tc.GroupAutoAllocate)
{
// Then changing the size of the control will alter how much space is
// reallocate and so need to recalculate all the nodes.
tc.InvalidateNodeDrawing();
}
}