Checkbox NSIS安装程序nsDialog复选框未按我认为的方式显示

我正在向NSIS安装程序添加自定义页面，但在添加复选框时遇到问题。我所看到的所有例子看起来都一样，这就是我正在做的，但我看不出有什么可能是错的。（我使用NSIS才一个小时左右！）

当页面出现时，复选框不存在：

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我的问题相当愚蠢。标签仅位于复选框上方，使其不可见。我的错误

!include MUI2.nsh
!include WordFunc.nsh
!insertmacro VersionCompare
!include LogicLib.nsh
!include InstallOptions.nsh
!include nsDialogs.nsh

Name "xxxxx"
;!define MUI_ICON "bcs.ico"
;!define MUI_HEADERIMAGE
;!define MUI_HEADERIMAGE_BITMAP "bcs.bmp"
;!define MUI_WELCOMEFINISHPAGE_BITMAP "bcs164.bmp"
;!define MUI_HEADERIMAGE_RIGHT

OutFile "nqcs_setup.exe"
InstallDir "$PROGRAMFILES\xxxx"
InstallDirRegKey HKLM "Software\xxxx" "InstallDir"
RequestExecutionLevel admin

Var Dialog
Var Heading
Var ServiceQuestion
Var SvcCheckBox

Function installOptionsPage

    nsDialogs::Create 1018
    Pop $Dialog

    ${If} $Dialog == error
        Abort
    ${EndIf}

    ${NSD_CreateLabel} 0 0 100% 50 "Installation Options"
    Pop $Heading
    CreateFont $0 "$(^Font)" "14" "500"
    SendMessage $Heading ${WM_SETFONT} $0 1

    ${NSD_CreateLabel} 0 50 100% 20 "Would you like to install as a service?"
    Pop $ServiceQuestion
    CreateFont $0 "$(^Font)" 11
    SendMessage $ServiceQuestion ${WM_SETFONT} $0 1

    ${NSD_CreateCheckbox} 50 50 100% 15 "Checkbox Test"
    Pop $SvcCheckBox
    ;GetFunctionAddress $0 OnCheckbox
    nsDialogs::OnClick $SvcCheckBox $0

    nsDialogs::Show

FunctionEnd