Tab shows a point after Caption

Hallo,
is it a bug or an feature?
1.) First line is after program start. White points after myTab1 and myTab2.
2.) Second line I selected myTab2. White point at myTab1 vanished.
3.) Third line I selected myTab3. White points after myTab1 and myTab2 vanished.
Is there a property to disable this, or is it an accident?
Best regards
is it a bug or an feature?
1.) First line is after program start. White points after myTab1 and myTab2.
2.) Second line I selected myTab2. White point at myTab1 vanished.
3.) Third line I selected myTab3. White points after myTab1 and myTab2 vanished.
Is there a property to disable this, or is it an accident?
Best regards