public static void Open(int importerIdx)
 {
     win = GetWindow <CustomAssetImporterEditorWindow>();
     win.titleContent.text = Title;
     win.minSize           = new Vector2(350, 400);
     win.selectedImporter  = importerIdx;
     win.Show();
     win.Initialize();
     win.treeViewState.lastClickedID = importerIdx;
 }
 static void OpenCustomModelImporter()
 {
     CustomAssetImporterEditorWindow.Open(3);
 }
 static void OpenCustomAudioImporter()
 {
     CustomAssetImporterEditorWindow.Open(1);
 }
 static void OpenCustomTextureImporter()
 {
     CustomAssetImporterEditorWindow.Open(2);
 }