`<Show Dialog="CustomTextA" OnExit="success" />` does not work - wix

Question

I have the following code in my wxs file:
<UI>
<Dialog Id="CustomTextA"
Width="370"
Height="270"
Title="$(loc.InstallDirDlg_Title)">
<Control Id="NextButton"
Type="PushButton"
X="236"
Y="243"
Width="56"
Height="17"
Default="yes"
Text="$(loc.WixUINext)">
<Publish Event="EndDialog"
Value="Return"><![CDATA[CustomTextA_NextArgs=""]]></Publish>
<Publish Event="NewDialog"
Value="[CustomTextA_NextArgs]"><![CDATA[CustomTextA_NextArgs<>""]]></Publish>
</Control>
....
</Dialog>
<InstallUISequence>
<Custom Action="CustomTextA_SetProperty_EDIT2"
After="CustomTextA_SetProperty_EDIT1" />
<Custom Action="CustomTextA_SetProperty_EDIT1"
After="ValidateProductID" />
<Custom Action="CustomTextA_SetProperty_EDIT3"
After="CustomTextA_SetProperty_EDIT2" />
<Custom Action="CustomTextA_SetProperty_EDIT4"
After="CustomTextA_SetProperty_EDIT3" />
<Custom Action="ERRCA_UIANDADVERTISED"
Before="AppSearch"><![CDATA[ProductState=1]]></Custom>
<Show Dialog="CustomTextA"
OnExit="success" />
</InstallUISequence>
<AdminUISequence>
<Show Dialog="CustomTextA"
OnExit="success" />
</AdminUISequence>
</UI>
but CustomTextA dialog is not displayed when the installation finishes successfully, and standard ExitDialog is shown.
What can be wrong in the code?
I am not sure what the customs actions like Custom Action="CustomTextA_SetProperty_EDIT2" for, but I left them to provide the code as it is.
Wix version is 3.11 (Probably something went wrong after upgrading from an earlier Wix version).

Answer 1

Summary: Please try to download the sample below and have a look at it in Visual Studio. Also read the step-by-step description below for how to use it as a template. I would gather all GUI-markup inside the WixUI_MyMondo.wxs file. Be sure to skim the previous answers linked too.
WiX Custom Dialog Sample: I have a WiX custom GUI sample here (just click download). It is a "Hello WiX" kind of thing - intended to be as simple as possible, but no simpler. In other words it is just doing a couple of things.
It copies the standard WiX dialog source markup in the file WixUI_Mondo.wxs and calls the new file WixUI_MyMondo.wxs. It is put next to Product.wxs.
The main Product.wxs file then includes the customized version with <UIRef Id="WixUI_MyMondo" /> (instead of the standard <UIRef Id="WixUI_Mondo" />) allowing the WixUI_MyMondo.wxs file to be changed as desired.
The rest of the dialogs are linked from the WixUIExtension.dll file (as normal).
I always keep all the dialog events and configurations inside WixUI_MyMondo.wxs - meaning that I try to avoid dialog constructs inside Product.wxs.
Please download and check the sample. It is impossible - as far as I can tell - to deduce more from the markup you have provided.
Previous Answers: Here are two previous answers on the issue of WiX GUI. Rather than rewriting the content in a way that could miss your real question, please skim them will you?
General information on Custom WiX / MSI GUI
Changing dialog order
Links: Some further links here on setup GUI. Burn is WiX's setup.exe generator. It can have its own GUI separate from that embedded in MSI files.
Burn: WiX's bootstapper setup.exe generator: WIX Installer with modern look and feel
More on Burn: Removing Default dialogs from MSI