I've tried the following code to change the FieldSize but I can't make it equal the actual value of MenuSize and I tried to remove first Delimiter but I can't.
ActionMenu["PopupMenu",
Flatten@Table[{Delimiter, lable1}, {ittration3, 1, 3}],
Appearance -> "PopupMenu", Enabled -> True,
Background -> RGBColor[0.235, 0.486, 0.768], FieldSize -> 6]
And please tell me how to change the background color of the field.


Riffle[{"Label1", "Label2", "Label3"}, Delimiter]to introduce delimiters only between labels. – István Zachar Dec 21 '12 at 16:35