Back/Next Button in UI using Wix toolset - wix

Question

I can not make adequate buttons to move normally between windows.
My installer contains 3 windows. If I do "NewDialog" in "Back-button", the windows open once again. And if I do "EndDialog"- the windows disappear.
<UI Id="UserInterface">
<Property Id="WixUI_Mode" Value="Custom" />
<TextStyle Id="WixUI_Font_Normal" FaceName="Tahoma" Size="8" />
<TextStyle Id="WixUI_Font_Bigger" FaceName="Tahoma" Size="9" Bold="yes" />
<TextStyle Id="WixUI_Font_Title" FaceName="Tahoma" Size="9" Bold="yes" />
<Property Id="DefaultUIFont" Value="WixUI_Font_Normal" />
<DialogRef Id="ProgressDlg" />
<DialogRef Id="ErrorDlg" />
<DialogRef Id="FilesInUse" />
<DialogRef Id="FatalError" />
<DialogRef Id="UserExit" />
<Dialog Id="IISSettings" Width="250" Height="160" Title="IIS Settings">
<Control Type="Text" Id="HostNameEditLabel" X="10" Y="10" Width="200" Height="15" Text="Hostname" />
<Control Type="Edit" Id="HostNameEdit" X="10" Y="30" Width="118" Height="15" Property="HOSTNAME" Text="{80}" Indirect="no" />
<Control Type="PushButton" Id="BrowseLicenseFile" X="165" Y="70" Width="75" Height="15" Text="Browse...">
<Publish Event="DoAction" Value="BrowseForCertificateFileCA" Order="1"><![CDATA[1]]></Publish>
<Publish Property="CERTPATH" Value="[CERTPATH]"><![CDATA[1]]></Publish>
</Control>
<Control Type="Text" Id="PasswordLabel" X="10" Y="90" Width="82" Height="15" Text="Сertificate password" />
<Control Type="Edit" Password="yes" Id="CertificatePassword" X="10" Y="105" Width="123" Height="15" Property="PASSCERT" />
<Control Type="PushButton" Id="Next" X="184" Y="130" Width="56" Height="15" Default="yes" Text="!(loc.WixUINext)">
<Publish Event="EndDialog" Value="Return"></Publish>
</Control>
<Control Type="PushButton" Id="Cancel" X="120" Y="130" Width="56" Height="15" Cancel="yes" Text="!(loc.WixUICancel)">
<Publish Event="SpawnDialog" Value="CancelDlg">
</Publish>
</Control>
</Dialog>
<Dialog Id="PortControlUserService" Width="370" Height="200" Title="Settings">
<Control Id="InfoText" Type="Text" X="10" Y="10" Width="350" Height="15" Text="*У пользователя должны быть права администратора на клиентских компьютерах!" />
<Control Id="DbServerNameEditLabel" Type="Text" X="10" Y="35" Width="350" Height="15" Text="User login" />
<Control Id="DbServerNameEdit" Type="Edit" X="10" Y="50" Width="350" Height="18" Property="USERLOGIN" Text="{80}" Indirect="no" />
<Control Id="PasswordEditLabel" Type="Text" X="10" Y="85" Width="350" Height="15" Text="User Password" />
<Control Id="PasswordEdit" Type="Edit" Password="yes" X="10" Y="100" Width="350" Height="18" Property="USERPASSWORD" Text="{80}" Indirect="no" />
<Control Id="Back" Type="PushButton" X="156" Y="130" Width="56" Height="17" Text="!(loc.WixUIBack)">
<Publish Event="NewDialog" Value="IISSettings"></Publish>
</Control>
<Control Id="Next" Type="PushButton" X="236" Y="130" Width="56" Height="17" Default="yes" Text="!(loc.WixUINext)">
<Publish Event="EndDialog" Value="Return"></Publish>
</Control>
<Control Id="Cancel" Type="PushButton" X="304" Y="130" Width="56" Height="17" Cancel="yes" Text="!(loc.WixUICancel)">
<Publish Event="SpawnDialog" Value="CancelDlg"></Publish>
</Control>
</Dialog>
<Dialog Id="PortControlParams" Width="370" Height="350" Title="Settings">
<Control Id="DbServerNameEditLabel" Type="Text" X="10" Y="10" Width="350" Height="15" Text="Database Server Name" />
<Control Id="DbServerNameEdit" Type="Edit" X="10" Y="35" Width="350" Height="18" Property="DBSERVERNAME" Text="{80}" Indirect="no" />
<Control Id="DbInstanceNameEditLabel" Type="Text" X="10" Y="60" Width="350" Height="15" Text="Database Instance Name" />
<Control Id="DbInstanceNameEdit" Type="Edit" X="10" Y="85" Width="350" Height="18" Property="DBINSTANCENAME" Text="{80}" Indirect="no" />
<Control Id="PasswordEdit" Type="Edit" Password="yes" X="10" Y="235" Width="350" Height="18" Property="DBPASSWORD" Text="{80}" Indirect="no" />
<Control Id="Back" Type="PushButton" X="156" Y="273" Width="56" Height="17" Text="!(loc.WixUIBack)">
<Publish Event="NewDialog" Value="PortControlUserService"></Publish>
</Control>
<Control Id="Next" Type="PushButton" X="236" Y="273" Width="56" Height="17" Default="yes" Text="!(loc.WixUINext)">
<Publish Event="EndDialog" Value="Return"></Publish>
</Control>
<Control Id="Cancel" Type="PushButton" X="304" Y="273" Width="56" Height="17" Cancel="yes" Text="!(loc.WixUICancel)">
<Publish Event="SpawnDialog" Value="CancelDlg"></Publish>
</Control>
</Dialog>
<Publish Dialog="ExitDialog" Control="Finish" Event="EndDialog" Value="Return" Order="999">1</Publish>
<InstallUISequence>
<Show Dialog="IISSettings" Before="PortControlUserService" ></Show>
<Show Dialog="PortControlUserService" Before="PortControlParams" ></Show>
<Show Dialog="PortControlParams" Before="ExecuteAction" ></Show>
</InstallUISequence>
</UI>
if I add "SpawnDialog" in "Back button", the windows will appear on top of another window, and I need to have one window. Looked at a lot of forums, but it's hard.

Answer 1

Dialog Order: Please see if this is helpful: Wix, custom dialog when previous version exists.
Dialog Customization: There is this answer on the overall topic of Customizing WiX Dialogs. Perhaps also see Helge Klein's real world sample (Wayback - Archived Version) for dialog changes (ServerDlg.wxs, WixUI_HK.wxs, LicenseAgreementDlg_HK.wxs) and many other nice features. Customizing Built-in WixUI Dialog Sets.
And throwing in this "general WiX quick start tips".