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[pinalrafael]

First, very good, I recommend. Second, during development I came across some problems and would like to share: 1- In the ListBox, when I put inside a panel or Tab, it was necessary to add an extra size [Line 769] if (_scrollBar.Maximum < _scrollBar.Value + Height + 44) _scrollBar.Value = _scrollBar.Maximum - Height + 44; 2- In TabSelector I added a property for the user to choose the size of the Tab: private int _tab_width;

[Category("Material Skin"), Browsable(true), DisplayName("Tab Width"), DefaultValue(100)]
        public int TabWidthTab
        {
            get { return _tab_width; }
            set
            {
                if (value < 1)
                    throw new ArgumentOutOfRangeException("Tab Width", value, "Value should be > 0");
                else
                {
                    _tab_width = value;
                    refresh();
                }
            }
        }

In the constructor: TabWidthTab = 100; On UpdateTabRects:

if (i==0)
                                _tabRects.Add(new Rectangle(FIRST_TAB_PADDING - (TAB_HEADER_PADDING), 0, TabWidthTab, Height));
                            else
                                _tabRects.Add(new Rectangle(_tabRects[i - 1].Right, 0, TabWidthTab, Height));

[leocb]

If you can, please open a new pull request with your fix