Button in GUI BeginScrollView problem

I just edited my inventory script to use the beginScrollView function. However my button to open the sub menu no longer works in it. Any ideas why? Go under assumption that all variables are defined. code:

function OnGUI() {

 numberOfItems = 0;

 buttonPosX = 10;

 buttonPosY = 25;

 if(openInventory == true)
 {

    if(openSubMenu == true)
    {
      SubMenu();
    }

    //begin scroll view
    scrollVector = GUI.BeginScrollView(Rect(0, 0, Screen.width/2, 
    Screen.height/2),scrollVector, Rect(0, 0, 450, 450));

    //put stuff in scroll view
    GUI.TextArea(Rect(0,0,450,450), "INVENTORY");

    for(items in menuItems)
    {
      if(GUI.Button(Rect(buttonPosX, buttonPosY, 100, 50), items))
      {
       openSubMenu = true;
       currentItem = items;
      }

      buttonPosX = buttonPosX + 125;
      numberOfItems += 1;

      if(numberOfItems %4 == 0)
      {
       buttonPosX = 10;
       buttonPosY = buttonPosY + 115;
      }
    }

    GUI.EndScrollView();

    //GUI.Box(Rect(0, 0, Screen.width/2, Screen.height/2),"INVENTORY");
 }

 if(activateIW == true)
 {
    GUI.Box(Rect(Screen.width - 225, 10, 215,25), "object is already in your inventory");
 }

}