Thank you very much I was thinking a way to complicated. Started already to write my own class.
That small code snippet will boost my work on hextool a lot.

The code at sourceforge was my starting point and I changed the gui and keyhandling. Some work I have done could be seen in the maemo repo. However I will try to upload my code changes to github. But this will take some time because I have different source codes for different platforms, so I need to cook them together and publishing only one code.