visual indicator (a +-sign) to expand data in Listview (In MFC)

Question

I want to implement a visual indicator (a +-sign) to expand data in Listview (In MFC). This Listview is part of treevew control

like there is + sign befor Test, a Array type data, when i will click on + sign it should expand.

Before

+Test

After

-

|Test[1]

|Test[2]

|Test[3]

|Test[4]

|Test[5]

|Test[6]

|Test[7]