Mystery of the Disappearing X

[Malsomnus]

My add-on has this frame which has a little X in the corner to close it.
The frame shows automatically on login.
When I just login, everything's fine. When I /reload, however, the X does not show. It's there, it's clickable, it works, but it's invisible.
I can make it visible again by changing its text.
Does anybody have any idea what the hell?

f.btnX = CreateFrame ("EditBox", nil, f)
f.btnX:SetPoint ("TOPRIGHT", f, "TOPRIGHT")
f.btnX:SetSize (10,12)
f.btnX:SetTextColor (1.0,0.77,0.27,1.0)
f.btnX:SetTextInsets (0, 0, 2, 2)
f.btnX:SetFont ("Fonts\\FRIZQT__.TTF", 11)
f.btnX:SetAutoFocus (false)
f.btnX:Disable ()
f.btnX:SetText ('x')
f.btnX:SetScript ("OnMouseDown", function (self, button)
    f:Hide ()
end)

[sirann]

f:Show() before the onclick? also what's f.btnX: Disable()?

[Malsomnus]

It's pretty old recycled code, but IIRC I'm using an EditBox instead of, err, anything that makes sense, because I used to have problems with the click events, and Disable just means it's not used as an actual text box that you can focus and edit.
And :Show doesn't help, since technically it is already shown.

[Edit]
I've replaced it with a proper button for now just so I can push a new version, but I'm still curious about what caused this problem.

[semlar]

Sounds like its frame level is below some other texture on your frame?

Could just be covered up.

Alternatively, since it's an edit box your text may just be getting cleared.

[Duugu]

I came to this thread expecting a thrilling Twilight_Zone story about the "Mystery of the Disappearing X". And now this. How disappointing.

[Seerah]

Wait, wait, wait... Why are you using an editbox to close your frame?

/edit: okay, so I read the rest of the thread. But my mind was totally blown by ^^^ that I couldn't focus on anything afterward.