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 TintColor and also the Font Color. In the case of iOS 7, this will adjust the outline color of the transparent button (and fill color when the button is clicked) and on Android, it will change the fill color. For your font, you can also adjust the color depending on the button state (i.e. focused, pressed etc.).
Using the new Tint support allows you to quickly change the user interface theme of your mobile applications without editing style files.