When I enabled SplitButton on a RadButton, I noticed the button text was centered in relation to the entire button including the split arrow. I found that when setting a width on the button (in aspx or code-behind), that this occurs. If I remove the set width, the button text now centers in relation to the non-split/arrow area. I basically just removed the set width when I dynamically split the button and add the set width when I don't need to split, so work-around was easy. I just wanted to point this out in case anyone else has encountered or if there is just some style/attribute/property I'm missing.