WoWInterface - Question about a SecureUnitButton

Hi!

I am currently trying to understand the SecureUnitButtonTemplate.
Reading a little in the FrameXML, I've come to think, that this example code should basically create a frame that behaven like the player frame:

Code:

f = CreateFrame("Button", nil, UIParent, "SecureUnitButtonTemplate")

f:SetHeight(100)

f:SetWidth(100)

f:SetPoint("TOPLEFT",UIParet, "TOPLEFT", 100, -100)

f:SetAttribute("unit", "player")

f:EnableMouse(true)

f:SetBackdrop({bgFile = "Interface/Tooltips/UI-Tooltip-Background", 

        edgeFile = "", 

        tile = true, tileSize = 32, edgeSize = 16, 

        insets = { left = 0, right = 0, top = 0, bottom = 0 }})

RegisterUnitWatch(f)

This frame is automatically shown (and hides, when I set unit as "target"), but I cannot left-click it to target myself and right-click does not produce a menu.
Any help is greatly appreciated.

Greetz
Vaeyl of Nozdormu