[Resike]

Originally Posted by MunkDev This does work for the glyph frame, but it opens the glyph frame regardless of the tabnumber given!

Havn't really tested the last one through, but try this one:

function ToggleTalentTab(tabNumber)
    if not PlayerTalentFrame then
        LoadAddOn("Blizzard_TalentUI")
    end
    if not PlayerTalentFrame:IsShown() then
        -- To prevent feral specs to pop up
        if type(tabNumber) ~= "number" then
            return
        end
        if tabNumber < 1 or tabNumber > 4 then
            return
        end
        ShowUIPanel(PlayerTalentFrame)
        PanelTemplates_SetTab(PlayerTalentFrame, tabNumber)
        if tabNumber == 1 then
            PlayerTalentFrame_ShowsSpecTab()
            PlayerTalentFrame_HideTalentTab()
            PlayerTalentFrame_HideGlyphFrame()
            PlayerTalentFrame_HidePetSpecTab()
        elseif tabNumber == 2 then
            PlayerTalentFrame_HideSpecsTab()
            PlayerTalentFrame_ShowTalentTab()
            PlayerTalentFrame_HideGlyphFrame()
            PlayerTalentFrame_HidePetSpecTab()
            -- This is some serious real hack here
            HideUIPanel(PlayerTalentFrame)
            ShowUIPanel(PlayerTalentFrame)
        elseif tabNumber == 3 then
            GlyphFrame_LoadUI()
            PlayerTalentFrame_HideTalentTab()
            PlayerTalentFrame_HideSpecsTab()
            PlayerTalentFrame_ShowGlyphFrame()
            PlayerTalentFrame_HidePetSpecTab()
        elseif tabNumber == 4 then
            PlayerTalentFrame_HideTalentTab()
            PlayerTalentFrame_HideSpecsTab()
            PlayerTalentFrame_HideGlyphFrame()
            PlayerTalentFrame_ShowPetSpecTab()
        end
    else
        HideUIPanel(PlayerTalentFrame)
    end
end

Edit: Fixed a typo.

PlayerTalentFrame_ShowsSpecTab
PlayerTalentFrame_HideSpecsTab

Seems like the show is only spec, while the hide function is specs.

This should work now properly.

The best thing if you call it without an argument 2-3 times then you can choose a feral spec. :P