forms - How to sort textboxes and buttons selection order in C# -

i have program :

enter image description here

when user filling form pressing tab button in keyboard, should go next button or textbox shown in image red numbers.

but after filling number 2, when press tab, select row in gridview!

after ... how can sort ?

with form open, go menu view -> tab order:

enter image description here

this displays current tab ordering on form:

enter image description here

by clicking on controls, can define new tab ordering:

enter image description here

Overvie