Add a window to an existing MUI Page - winapi

Question

Is it possible to add a window(a Label) to an existing MUI page; like the installer page, welcome page?
I would like to add a new label to the installer page. My code below adds a new Static window to the window but its never shown/sits above other windows. I know the window exists because I can see it using WinSpy++ but it sits behind another window. Also the new window has a funny style "Style: 50000000 (hidden, enabled)" whilst other normal static windows have the style "Style: 5000008C (visible, enabled)".
How can I get my label(Static Window) to show?
!include nsdialogs.nsh
!include MUI2.nsh
!define MUI_PAGE_CUSTOMFUNCTION_SHOW instshow
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_LANGUAGE "English"
OutFile "test.exe"
Function instshow
FindWindow $0 "#32770" "" $HWNDPARENT
GetDlgItem $2 $0 1016
System::Call 'USER32::CreateWindowEx(i0,t "STATIC",t "Some option",i ${WS_CHILD}|${WS_VISIBLE},i100,i100,i100,i20,i$2,i666,i0,i0) $R2'
System::Call `user32::SetWindowPos(i $R2, i ${HWND_TOP}, i 0, i 0, i 0, i 0, i ${SWP_NOSIZE}|${SWP_NOMOVE})` # attempt to push new label to front
# Attempt to refresh new labels parent window
GetDlgItem $R0 $HWNDPARENT 1016
ShowWindow $R0 ${SW_HIDE}
ShowWindow $R0 ${SW_SHOW}
# Attempt to refresh new label
ShowWindow $R2 ${SW_HIDE}
ShowWindow $R2 ${SW_SHOW}
FunctionEnd
Section "Dummy"
SectionEnd

Answer 1

Ok heres how to do it. Thanks for the advice Anders
!include nsdialogs.nsh
!include MUI2.nsh
!define MUI_PAGE_CUSTOMFUNCTION_SHOW instshow
!insertmacro MUI_PAGE_INSTFILES
!insertmacro MUI_LANGUAGE "English"
OutFile "test.exe"
Function instshow
FindWindow $0 "#32770" "" $HWNDPARENT
System::Call 'USER32::CreateWindowEx(i0,t "STATIC",t "Some text",i ${WS_CHILD}|${WS_VISIBLE},i100,i100,i100,i20,i $0,i222,i0,i0) $R2'
GetDlgItem $1 $0 1027
GetDlgItem $2 $0 222
SendMessage $1 ${WM_GETFONT} 0 0 $3
SendMessage $2 ${WM_SETFONT} $3 1
FunctionEnd
Section "Dummy"
SectionEnd