ComboBox with Tree Dropdown

Environment:VC6, Win200, ME (has not test on other OS)

Using the Class

Just as you normally would, place a ComboBox on the dialog. And name it m_comboBoxFolder.
Add the files ComboBoxFolder.cpp, ComboBoxFolder.h, TreeCtrlFolder.cpp, TreeCtrlFolder.h, Folder.cpp and Folder.h to your project.
Import the bitmap files folder0.bmp and give them resource Ids of "IDB_FOLDER".
In the header file for the dialog, add an include for ComboBoxFolder.h at the top. Manually change variable from CComboBox m_comboBoxFolder; in step 1 to CComboBoxFolder m_comboBoxFolder;
In the dialog's OnInitDialog() function, call m_comboBoxFolder.Init(0, 300) for setting dropped width and height of a tree dropdown.

To add path to tree-dropped-down call:

m_comboBoxFolder.AddPath("C:\\Windows\\temp");

Whenever a user selects an item in the tree-dropped-down, a message, WM_SELECTITEM_CHANGE, will be sent to Dialog: A small demo below shows how to catch the message and get parameter has been passed.

ON_MESSAGE(WM_SELECTITEM_CHANGE, OnSelectItemChange)

long CTestDlg::OnSelectItemChange(WPARAM w, LPARAM l)
{ CString path = "";
 CFolder* folder = (CFolder*) w;
 if (folder != NULL)
   path = folder->m_path;

 return 0;
}

To get path selected in the tree-dropped-down call:
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```
m_comboBoxFolder.GetSelectedPath()
```

I haven't added too much here insofar as explanation of code because the code is included and very easy to understand.