[KaktoR]

What you mean with "win dir part" ?

For icons create first variables then functions and procedures

Example:

var
StartMenuIcons, DesktopIconCheckBox: TNewCheckBox;


function CreateIcons: Boolean;
begin
  Result := DesktopIconCheckBox.Checked;
end;

procedure StartMenuIconsClick(Sender: TObject);
begin
  if StartMenuIcons.Checked = True then begin
    WizardForm.GroupEdit.Enabled := False;
    WizardForm.GroupBrowseButton.Enabled := False;
  end else begin
    WizardForm.GroupEdit.Enabled := True;
    WizardForm.GroupBrowseButton.Enabled := True;
  end;
end;

Then checks for Icons

[Icons]
Name: "{group}\{#AppName}"; Filename: "{app}\{#AppExec}"; Check: CreateIcons
Name: "{commondesktop}\{#AppName}"; Filename: "{app}\{#AppExec}"; Check: CreateIcons

After this you have to place it in WizardForm like this

procedure InitializeWizard();
begin

StartMenuIcons := TNewCheckBox.Create(WizardForm);
  with StartMenuIcons do begin
    Parent := WizardForm.SelectDirPage;
    Left := ScaleX(8);
    Top := ScaleY(150);
    Width := ScaleX(240);
    Height := ScaleY(17);
    Caption := 'Create Start menu icons';
    OnClick := @StartMenuIconsClick; //Which action should be performed when OnClick (=clicked)
  end;

  DesktopIconCheckBox := TNewCheckBox.Create(WizardForm);
  with DesktopIconCheckBox do begin
    Parent := WizardForm.SelectDirPage;
    Left := ScaleX(8);
    Top := ScaleY(170);
    Width := ScaleX(240);
    Height := ScaleY(17);
    Caption := 'Create Desktop icon';
  end;

end;

For left/top/width/height you can also use SetBounds(Left, Top, Width, Height);.