In my application, only the license screen and then the installation directory screen, and I use this configuration block for this:
<Property Id="WIXUI_INSTALLDIR" Value="INSTALLLOCATION" />
<UIRef Id="WixUI_InstallDir" />
<WixVariable Id="WixUILicenseRtf" Value="License.rtf" />
immediately before the tag </Product>. All applications are installed in INSTALLLOCATIONthe section <Directory>.
WixUI