AxtiveX tab Problem

AOA
I have made (Enhanced textbox) activex control of Textbox using vb activeX wizard and add some more functionality. now the activex working nice but when i put two or three textboxes(own activeX) on form then there is a TAB problem. cursor can't move to next textbox runtime even pressing TAB.

i install new VB6 and It is working fine.

problem is still there if i use form2 lib. then their is tab problem