In RAD Studio XE6, we introduced a new property for TSpeedButton, TButton and TToolbar called 'Tint'. The Tint property is enabled based on your StyleLookUp selection for the particular component.
For example, if you have a TSpeedButton selected with StyleLookUp = actiontoolbutton, you will see a Tint property in the Object Inspector called IconTintColor since this style element consists of a glyph.
For text based buttons, such as StyleLookUp = listitembutton, you can change the TintCo...