Taskbar icon flashes when editor window open

I have a strange glitch in w$$anonymous$$ch the unity's Windows taskbar icon flashes like so whenever my ToolBar editor window is open.

I dont see any reason why is should do t$$anonymous$$s so I'd be interested to see what you guys t$$anonymous$$nk about it :P

 using UnityEngine;
 using UnityEditor;
 using System.Collections;
 using System.Collections.Generic;
 
 [InitializeOnLoad]
 public class ToolBox : EditorWindow {
     
     /* T$$anonymous$$s class provides the toolbox menu you see, allowing you to select tools to use in the
      * main program.
     */
     
     static Texture2D[] icons = null;
     
     static int selected = 0;
     static int lastSelection = 0;
     
     public static void OpenToolbox(){
         //Opens the toolbox window
         ToolBox window = (ToolBox)EditorWindow.GetWindow(typeof(ToolBox));
         window.position = new Rect(window.position.x, window.position.y, 100, window.position.height);
         
         LoadIcons();
     }
     
     static void LoadIcons(){
         //Load icons into array
         List<Texture2D> newIcons = new List<Texture2D>();
         foreach( string path in new string[] {"ArrowTool.png","LineTool.png","RectTool.png"} ){
             Texture2D icon = (Texture2D)Resources.LoadAssetAtPath("Assets/Modeler/Icons/"+path, typeof(Texture2D) );
             if( icon )
                 newIcons.Add( icon );
         }
         icons = newIcons.ToArray();    
     }
     
     void OnGUI(){
         //Calculate the number of colums there should be in the grid
         int c = (int)Mathf.Round(EditorWindow.GetWindow(typeof(ToolBox)).position.width/75);
         if( icons != null && icons.Length > 0 )
             selected = GUILayout.SelectionGrid(selected, icons, c);
         else
             LoadIcons();
         
         //Make sure we only enter line drawing mode when we have a mesh filter to edit
         if( selected != 0 && (!Selection.activeGameObject || !Selection.activeGameObject.GetComponent<MeshFilter>()) )
             selected = 0;
     }
     
     public static int GetCurrentCursor(){
         return selected;
     }
     
 }