Resizing images (or icons) appearing on menu...

Hi!

 

My question is maybe "stupid". But important for me.

I do make my menu and I putted "toolStripButton" attached to small image as you know. But my image are looking very, very small (smallest). I had looking on the properties to resize it (to become more bigger). But I didnt find which option can make it more little bit bigger (just a good looking size).

Anyone can help please. Thanx.