Reselect form field after using Microsoft dynamic AX in Windows Application

Hi,

I have a window form that is connected to Microsoft dynamic AX. 

I have a textbox in the winform, then when i insert data in the textbox, it will go to AX then i will enter a password in popup box in AX, then it will go back to winform.

The problem is when it went back to winform the textbox is not focus. When i press enter then, the textbox is focused back.

I tried to use sendkey ENTER but it enter in the AX popup box not the winform.