I skipped it using:
<UI>
<UIRef Id="WixUI_InstallDir" />
<Publish Dialog="WelcomeDlg"
Control="Next"
Event="NewDialog"
Value="InstallDirDlg"
Order="2">1</Publish>
<Publish Dialog="InstallDirDlg"
Control="Back"
Event="NewDialog"
Value="WelcomeDlg"
Order="2">1</Publish>
</UI>