strange behaviour of <RunProgram> in config.xml

I tried to add a "Launch Application" to the end of the installation process by using <RunProgram> in the <Installer> section of the config.xml file. But it does not work as expected. Part of the config.xml:

<Installer>
  <Name>MyApp</Name>
  <Version>1.0</Version>
  <TargetDir>@rootDir@/MyApp</TargetDir>
  <RunProgram>MyApp</RunProgram>
  <RunProgramDescription>Launch My App</RunProgramDescription>
</Installer>

The "Launch" checkbox appears as expected at the end of the installation process, but the program does not start. I figuerd out, only programs in the system path starts. I tried to change the run tag like:

  <RunProgram>@TargetDir@/MyApp</RunProgram>

Now the program starts, but only if the user not changes the default install path set by <TargetDir>.
Also, the "Launch Application" Checkbox appears after the uninstall process.

I figured out the problem for the wrong path.
File installer-framework\src\libs\installer\packagemanagergui.cpp line 1921

const QString program = packageManagerCore()->replaceVariables(packageManagerCore()->value(scRunProgram));

this line sould be

const QString program = packageManagerCore()->replaceVariables(packageManagerCore()->settings().runProgram());

with this change, the path is updated to the users input