Inserting Custom Action between Dialogs (InstallUISequence) in WiX

Question

I have two custom dialog boxes (plus the required ones ExitDlg, FatalErrorDlg, etc.), the first one sets a property using an Edit control and the s

Answer 1

Rather than scheduling the custom action in the InstallUISequence you can publish it on the button click:

<Dialog Id="DialogA" ...>
   <Control Id="ControlEdit" Type="Edit" Property="MY_PROPERTY" .../>
   <Control Id="ControlNext" Type="PushButton" ...>
       <Publish Event="DoAction" Value="MyCustomAction">1</Publish>
       <Publish Event="EndDialog" Value="Return">1</Publish>
   </Control>
</Dialog>

EDIT: The Publish element's condition needs to explicitly evaluate to true to run, so add "1" as the text of the Publish elements.