Trefniant botymau ar y bar teitl. Dylai'r gwerth yma fod yn llinyn megis "menu:minimize,maximize,close"; Mae'r colon yn gwahanu cornel chwith y ffenest o'r gornel dde, ac mae enwau'r botymau wedi eu gwahanu gan goma. Ni chaniateir botymau dyblyg. Anwybyddir enwau botymau ni adnabyddir fel y gellir ychwanegu botymau newydd mewn fersiynau dyfodol o Metacity heb dorri fersiynau hŷn.
Arrangement of buttons on the titlebar. The value should be a string, such as "menu:minimize,maximize,spacer,close"; the colon separates the left corner of the window from the right corner, and the button names are comma-separated. Duplicate buttons are not allowed. Unknown button names are silently ignored so that buttons can be added in future metacity versions without breaking older versions. A special spacer tag can be used to insert some space between two adjacent buttons.