making sure they are the same size but for some reason they don''''t fit properly |
or you get one half on one state and the other on the next |
This is where you need a design solution, solution design.
But seriously, the first problem sounds like a margin adjustment problem. It is not easy to make these things line up properly. If it is a Start Menu, don''''t get frustrated. Those things can be a pain in the arse. Images get stretched and it can be frustrating. The best thing for the Start Menu is a good template size. Luna will not work well if you want a good Start Menu template. To get a good template for that, try to find a windowblind that does what you are trying to do. Then, use the sizes and margins settings from that Start Menu as a guide. This way you will be close to getting what you want. I found that my Template was very close to the sizes that Mormegil was using, so I was quite happy with mine.
When working with buttons, there are a few things that are most important. 1. The size of each button. Skin Studio will tell you that before you open the image. 2. The full size of the image. This is important because the full size is a multiple of the single button size. If the button size is 2x2, and the full size is 6x6, then you know that there are three button states. Sometimes you can look in the Help pane for more info about the button too. Some buttons even have space reserved but there is no image there. That is where the help pane can help too.
Some sections even want the single button size defined. If that is not set properly, it could lead to the sort of problem you are mentioning. Although, if there are three states and your image is 6x6, I think it is simple math. But, later on sometimes you understand why. And, if you think button states are fun, wait until you get to button animations.
Any further questions, please be specific. I asked tons of questions when I created my first skin. Try to post a picture of your problem too if you can. This will be your first windowblind, afterwards you will surely find design solutions and innovations on your own.

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