I have successfully implemented this method of using the Win32 API to set the background color of a treeview in VB 6: http://support.microsoft.com/kb/178491

However, one thing goes wrong: when you expand the tree nodes more than two levels deep, the area to the left of (and sometimes under) the inner plus [+] and minus [-] signs is still white.

Does anyone know how to get this area to the correct background color, too?

Note: I'm also setting the BackColor of each node, and also the BackColor of the treeview's imagelist.

Here's my version of the code:

Public Sub TreeView_SetBackgroundColor(TreeView As MSComctlLib.TreeView, BackgroundColor As Long)
    Dim lStyle As Long, Node As MSComctlLib.Node

    For Each Node In TreeView.Nodes
        Node.BackColor = BackgroundColor
    Next

    TreeView.ImageList.BackColor = BackgroundColor

    Call SendMessage( _
        TreeView.hwnd, _
        TVM_SETBKCOLOR, _
        0, _
        ByVal BackgroundColor)

    'Now reset the style so that the tree lines appear properly.
    lStyle = GetWindowLong(TreeView.hwnd, GWL_STYLE)
    Call SetWindowLong(TreeView.hwnd, GWL_STYLE, lStyle - TVS_HASLINES)
    Call SetWindowLong(TreeView.hwnd, GWL_STYLE, lStyle)
End Sub