The tool window buttons (TODO, Run etc.) don't look right. I think the reason while they don't is the underlining of the mnemonic. ? think it would look better if those mnemonics would be printed in a bold font and not be underlined. Then the text of the button could be aligned with the icon and maybe they would lose some one or two pixels in height.
Now the text of the buttons pushed to the top of the button and so the top of the buttons look crowded while in the bottom there is only this underline. What do you think?