public class MyNCheckBox : NCheckBox
{
    public MyNCheckBox()
    {
        Palette.ControlText = Color.Red;
    }
}

nContextMenu1.PaletteInheritance = PaletteInheritance.None;
nContextMenu1.Palette.HighlightLight = color1;
nContextMenu1.Palette.HighlightDark = color2;

treeView.Scrollable = false;

treeView.NodeMouseClick += TreeView_NodeMouseClick;

private void TreeView_NodeMouseClick(object sender, TreeNodeMouseClickEventArgs e)
{
    NTreeView view = sender as NTreeView;

    int lastIndex = view.Nodes.Count - 1;
    TreeNode lastNode1stLevel = view.Nodes[lastIndex];
    TreeNode lastNode = GetNextVisibleNodeRecursive(lastNode1stLevel);
    view.Height = lastNode.Bounds.Bottom;
}

private TreeNode GetNextVisibleNodeRecursive(TreeNode node)
{
    TreeNode nextNode = node.NextVisibleNode;
    if (nextNode == null)
    {
        return node;
    }
    else
    {
        nextNode = GetNextVisibleNodeRecursive(nextNode);
    }

    return nextNode;
}

public class MyNTabStrip : NTabStrip
{
    protected override void UpdateBackColor()
    {
        if (Parent == null || BackColor == Color.Transparent)
            return;

        NUIRenderer renderer = Renderer;
        Color c;

        if (renderer != null)
        {
            c = renderer.Palette.Control;
        }
        else
        {
            c = Parent.BackColor;
        }

        BackColor = c;
    }
}