Fix for Bug2: Problems in PhieuBanHang GUI.

[aeros281]

Things of change:

• Now the user can choose to enter value of MaKhachHang and MaSanPham by two ways:
  • Manually enter value.
  • Using external form (double click the cell content)
• A flag in PhieuBanHang CellEndEdit event handler is out of place, a quick fix is added.

[thaick9x]

" Using external form (double click the cell content) " where the f*ck

[aeros281]

Hở?

Cái issue https://github.com/thaick9x/baotri_quanly_tiemvang/issues/3 có mô tả rõ mà??