Mistake in a script... I can not understand where...

[and84]

Hi all!
Has written a script with custom page...
Here a part of a script...

PHP Code:

.... 
Page license 
Page custom CustomFun "" "" 
!insertmacro MUI_PAGE_INSTFILES 

ReserveFile "${NSISDIR}\Plugins\InstallOptions.dll" 
ReserveFile "page.ini" 

!insertmacro MUI_LANGUAGE "Russian" 

Section "-Install" 
... 
SectionEnd 

Function .oninit 
         InitPluginsDir 
         File /oname=$PLUGINSDIR\page.ini "page.ini" 
Functionend 

Function CustomFun 
         !insertmacro MUI_HEADER_TEXT "TEXT1" "TEXT2" 
         !insertmacro INSTALLOPTIONS_INITDIALOG "page.ini" 
         !insertmacro INSTALLOPTIONS_SHOW 
FunctionEnd 


The section of installation is carried out two times. I can not understand why.
Probably I was mistaken in macros.

Help please.
Thanks!