I still cannot edit my older messages, so I'm writing this new one.
Attached is the screen-shot of how the buttons look like in the program.
As you can see the green zone is the 25x25 pix square, just as the original icons.
I used this space at its maximum. You can also see the orange space that is quite big. Is it possible to give more space to the buttons? This way they could grow to at least 50x50 pix which is almost double.
The only problem that I suppose is that because KT has a lower resolution, such buttons might not have enough space on the screen. So maybe 36x36 or 48x48 would be OK for both? What would you say?