I tried to describe the problem in 4 steps:
1. line 3-33 is the script. When executing as 'perl sample_getSaveFile.pm' it works fine.
2. line 37: using PAR::Packer to package the very same script (from step 1) into a binary executable.
3. line 41-42: Executing the generated binary executable from step 2 show error messages
4. line 46-55: after including 'use Tk::Bitmap' into the script (line 3-33) and running the PAR::Packer again (step 2) the executable shows different error messages.

My question: "what am I doing wrong or what modules have to be included to satisfy PAR::Packer?"