WoWInterface - "Cutting" frame 'contents' on edges

I'm currently using a ScrollFrame to show some content (frames, textures, and stuff) 'inside' a container frame.
'inside' here means the contents are clipped at the container frame borders.

An basic example could be

Code:

local containerFrameObj = CreateFrame("ScrollFrame", "PeonManagerContainer", UIParent)

containerFrameObj.ScrollValue = 0



local contentObj = CreateFrame("Frame", "PeonManagerContent", containerFrameObj)

containerFrameObj:SetScrollChild(contentObj)



local stuffObj = CreateFrame("Button", "Stuff", contentObj)

With this sample code every child of PeonManagerContent (stuffObj here) is only visible within the borders of PeonManagerContainer.

My problem with this: unfortunately the ScrollFrame widget don't places the content stuff according to the content's parent/child structure. Furthermore the frame level and the frame strata are ignored inside a ScrollFrame (or at least they’re heavily buged). Due to this the ScrollFrame is more or less unusable for me – I must set frame levels and stratas for the contents.

But how could I implement this without a ScrollFrame? I have no ideas. :/