Creating GUI: Accessing GUIAchievements.currentpage

i first used to edit currentpage from private to public because they where changing in the game client, but not anymore in version 1.7.2, and i don't want to edit vanilla files.

here is my code: (i use it in a TickEvent event)

Minecraft minecraft = Minecraft.getMinecraft();

GuiScreen var15 = minecraft.currentScreen;

int var14;

if (var15 != null)

{

if (var15 instanceof GuiAchievements)

{

var14 = ((GuiAchievements)var15).currentPage;

if (AchievementPage.getTitle(var14).equals("Glacia"))

{

minecraft.thePlayer.openGui(mod_Glacia.instance, GlaciaCommonProxy.GUI_ID_ACHIEVEMENTS, minecraft.theWorld, var14, 0, 0);

}

}

if (var15 instanceof GuiAchievementsGlacia)

{

var14 = ((GuiAchievementsGlacia)var15).currentPage;

if (!AchievementPage.getTitle(var14).equals("Glacia"))

{

GuiAchievements var16 = new GuiAchievements(var15, minecraft.thePlayer.getStatFileWriter());

var16.currentPage = var14;

FMLClientHandler.instance().displayGuiScreen(minecraft.thePlayer, var16);

}

}

}