How to create Custom Dialog Themes for Basic MSI Project in InstallShield 2010

InstallShield provides some good default Themes and if you wonder how to create your own Custom Themes, which displays your product specific images on the Installation GUI, then this article is for you. This article explains the steps to create / use Custom dialog Themes in Basic MSI Project, which is an undocumented feature of InstallShield.
Steps to create Custom Dialog Themes
1. Go to <Installshield Installation Directory>\Support\Themes
2. Create a .Theme file say “My Custom.Theme” with following content
<?xml version="1.0" encoding="UTF-8"?>
<Theme Name="My Custom Theme" Path="My Custom Theme" Preview="preview.jpg" SetupImage="setup.gif">
<Transform id="welcome">
         <Add Control="Image" Type="Bitmap" Region="0 0 374 234" Attributes="1" Source="welcome.jpg"/>
         <Add Control="DlgLine" Type="Line" Region="0 234 374 0" Attributes="1"/>
</Transform>
<Transform id="interior">
         <Add Control="Banner" Type="Bitmap" Region="0 0 374 44" Attributes="1" Source="banner.jpg"/>
         <Add Control="BannerLine" Type="Line" Region="0 44 374 0" Attributes="1"/>
</Transform>
<Apply Transforms="welcome">
        <Match Size="374 266"/>
        <Include>
                <Name>AdminWelcome</Name>
                <Name>SetupCompleteError</Name>
                <Name>SetupCompleteSuccess</Name>
                <Name>SetupInitialization</Name>
                <Name>SetupInterrupted</Name>
                <Name>InstallWelcome</Name>
               <Name>MaintenanceWelcome</Name>
               <Name>PatchWelcome</Name>
               <Name>SetupResume</Name>
               <Name>SplashBitmap</Name>
               <Name>Exterior</Name>
        </Include>
</Apply>
<Apply Transforms="interior">
         <Match Size="374 266"/>
         <Exclude>
                  <Name>AdminWelcome</Name>
                  <Name>SetupCompleteError</Name>
                  <Name>SetupCompleteSuccess</Name>
                  <Name>SetupInitialization</Name>
                  <Name>SetupInterrupted</Name>
                  <Name>InstallWelcome</Name>
                  <Name>MaintenanceWelcome</Name>
                  <Name>PatchWelcome</Name>
                  <Name>SetupResume</Name>
                  <Name>SplashBitmap</Name>
                  <Name>Exterior</Name>
        </Exclude>
</Apply>
</Theme>
3. Create a folder say “My Custom Theme” along with “My Custom.Themes” file
4. Create the following images carrying your logo / brand / trademark with the below mentioned specification and copy them to
“<Installshield Installation Directory>\Support\Themes\My Custom Theme” directory

5. Launch InstallShield IDE, Open the existing project / Create New project

6. Go to User Interface --> Dialogs --> Themes, select the newly created theme ‘My Custom Theme’

Now all the dialogs either default or custom will have the New Theme.