Wix SetProperty by feature select | Launch specific feature after installation - wix

Question

My WixInstaller is installing two different Apps (Editor AND / OR Viewer).
After the Installation the user can check a checkbox for if he wants to launch the application.
By default, the WixShellExecTargetProperty has the value [#ViewerApp]. If the user has installed the Editor, the Property should have the value [#EditorApp]. But it is not assigned.
<CustomAction Id="LaunchApplication" BinaryKey="WixCA" DllEntry="WixShellExec" Impersonate="yes" />
<SetProperty Id="WixShellExecTarget" Value="[#EditorApp]" After="InstallExecute" Sequence="execute"><![CDATA[EditorFeature=3]]></SetProperty>
<Property Id="WixShellExecTarget" Value="[#ViewerApp]" />

Answer 1

Solution:
Here is my solution that works:
define the CustomAction for each apllication / feature that can/should be started.
<CustomAction Id="SetLaunchApplicationEditor" Property="WixShellExecTarget" Value="[#EditorApp]" />
<CustomAction Id="SetLaunchApplicationViewer" Property="WixShellExecTarget" Value="[#ViewerApp]" />
<CustomAction Id="LaunchApplication" BinaryKey="WixCA" DllEntry="WixShellExec" Impersonate="yes" />
on the last page, where the install is finished, define the start
<Control Id="Finish" Type="PushButton" X="236" Y="243" Width="56" Height="17" Default="yes" Cancel="yes" Text="[ButtonText_Finish]">
<Publish Event="EndDialog" Value="Return">1</Publish>
<Publish Event="DoAction" Value="SetLaunchApplicationViewer"><![CDATA[&ViewerFeature=3]]></Publish>
<Publish Event="DoAction" Value="SetLaunchApplicationEditor"><![CDATA[&EditorFeature=3]]></Publish>
<Publish Event="DoAction" Value="LaunchApplication">LaunchApp = 1</Publish>
</Control>
!!
If only the Viewer or Editor is installed, then this app is started. If both are installed, the Editor gets started, because it's DoAction is triggered afterwards.
Exit Dialog with the checkbox
<Dialog Id="HtExitDialog" Width="370" Height="270" Title="[ProductName] [Setup]" NoMinimize="yes">
<Control Id="Finish" Type="PushButton" X="236" Y="243" Width="56" Height="17" Default="yes" Cancel="yes" Text="[ButtonText_Finish]">
<Publish Event="EndDialog" Value="Return">1</Publish>
<Publish Event="DoAction" Value="SetLaunchApplicationViewer"><![CDATA[&ViewerFeature=3]]></Publish>
<Publish Event="DoAction" Value="SetLaunchApplicationEditor"><![CDATA[&EditorFeature=3]]></Publish>
<Publish Event="DoAction" Value="LaunchApplication">LaunchApp = 1</Publish>
</Control>
<Control Id="Cancel" Type="PushButton" X="304" Y="243" Width="56" Height="17" Disabled="yes" Text="[ButtonText_Cancel]" />
<Control Id="Bitmap" Type="Bitmap" X="0" Y="0" Width="370" Height="234" TabSkip="no" Text="[DialogBitmap]" />
<Control Id="Back" Type="PushButton" X="180" Y="243" Width="56" Height="17" Disabled="yes" Text="[ButtonText_Back]" />
<Control Id="Description" Type="Text" X="135" Y="70" Width="220" Height="20" Transparent="yes" NoPrefix="yes">
<Text>Click the Finish button to exit the [Wizard].</Text>
</Control>
<Control Id="BottomLine" Type="Line" X="0" Y="234" Width="370" Height="0" />
<Control Id="Title" Type="Text" X="135" Y="20" Width="220" Height="60" Transparent="yes" NoPrefix="yes">
<Text>{\VerdanaBold13}Completing the [ProductName] [Wizard]</Text>
</Control>
<Control Type="CheckBox" Id="StartApp" Width="142" Height="17" X="158" Y="120" Text="Launch Application" Property="LaunchApp" CheckBoxValue="1" />
</Dialog>