private void OnEnable()
 {
     _stylesButtonLabel       = new GUIContent("Styles");
     _TexturesButtonLabel     = new GUIContent("Textures");
     _styleGrid               = new StyleGrid();
     _styleGrid.ElementWidth  = _previewSize;
     _styleGrid.ElementHeight = _previewSize;
     _styleGrid.ElementCount  = 50;
     _styleGrid.UseBestFit    = true;
     _styleGrid.OnRepaint    += Repaint;
 }
 private void OnDisable()
 {
     _styleGrid.OnRepaint -= Repaint;
     _styleGrid            = null;
 }