Gostaria de desativar os controles na minha página personalizada (VST2DirPage) com base nos componentes selecionados. Eu tentei a condição:

if IsComponentSelected('VST64') then  
begin
  VST2DirPage.Buttons[0].Enabled := False;
  VST2DirPage.PromptLabels[0].Enabled := False;
  VST2DirPage.Edits[0].Enabled := False;
end

Mas os elementos parecem estar sempre desativados; portanto, parece que não está obtendo os valores corretos para funcionar corretamente. Script abaixo:

[Types]
Name: "full"; Description: "{code:FullInstall}";
Name: "custom"; Description: "{code:CustomInstall}"; Flags: iscustom

[Components]
Name: "VST64"; Description: "64-bit VST2"; Types: full; Check: Is64BitInstallMode
Name: "VST"; Description: "32-bit VST2"; Types: full; Check: Is64BitInstallMode
Name: "VST"; Description: "32-bit VST2"; Types: full; Check: not Is64BitInstallMode

[Code]
var VST2DirPage: TInputDirWizardPage;

procedure InitializeWizard;
begin
  VST2DirPage := CreateInputDirPage(wpSelectComponents,
    'Confirm VST2 Plugin Directory', '',
    'Select the folder in which setup should install the VST2 Plugin, then click Next.',
    False, '');

  VST2DirPage.Add('64-bit folder');
  VST2DirPage.Values[0] := ExpandConstant('{reg:HKLM\SOFTWARE\VST,VSTPluginsPath|{pf}\Steinberg\VSTPlugins}');
  VST2DirPage.Add('32-bit folder');
  VST2DirPage.Values[1] := ExpandConstant('{reg:HKLM\SOFTWARE\WOW6432NODE\VST,VSTPluginsPath|{pf32}\Steinberg\VSTPlugins}');

  if not Is64BitInstallMode then
  begin
    VST2DirPage.Buttons[0].Enabled := False;
    VST2DirPage.PromptLabels[0].Enabled := False;
    VST2DirPage.Edits[0].Enabled := False;
  end;
end;