Data := FATtabs.AddTab(-1, 'something', ts, False, clSilver, FTabImageIndex); // Data: TATTabData;
// Both are behaving equally here::
//FATtabs.OptShowXButtons := atbxShowNone;
Data.TabHideXButton := True;
// And later ...:
S := 'yy ';
Data.TabCaption := S;
FATtabs.Invalidate; // test-only, should be called internally