[Kapone]

Okey. but ive tried out

local n = GetNumGroupMembers()
if IsInRaid() and n > 1 and n < 10 then
     self:hide()
else
     self:show()
end

and

local n = GetNumGroupMembers()
if IsInRaid() and n > 0 and n < 11 then
     self:Show()
else
     self:Hide()

took a shot with

if IsInRaid() and GetNumGroupMembers() >=1 and GetNumGroupMembers() <= 10 then
     self:Show()
else
     self:Hide()

also

local raid = GetNumGroupMembers()
if IsInRaid() and raid >= 1 and raid <= 10 then
     self:Show()
else
     self:Hide()
end

And still my 10 man and 25 man panel is showing at the same time =(
Im not sure if the onload is right or if i just put things in wrong place's =/

Onload:

self:RegisterEvent("GROUP_ROSTER_UPDATE")