By default, all TreeView controls whose version number is 4.70 or higher display the text of the node under the cursor if the node itself isn’t completely visible. You can turn off and on this feature by resetting a bit in the control’s style, using the following code:

Private Declare Function SetWindowLong Lib "user32" Alias "SetWindowLongA" _    (ByVal hwnd As Long, ByVal nIndex As Long, ByVal dwNewLong As Long) As LongPrivate Declare Function GetWindowLong Lib "user32" Alias "GetWindowLongA" _    (ByVal hwnd As Long, ByVal nIndex As Long) As LongConst TVS_NOTOOLTIPS = &H80Const GWL_STYLE = (-16)' turn tooltips offSetWindowLong TreeView1.hwnd, GWL_STYLE, GetWindowLong(TreeView1.hwnd, _    GWL_STYLE) Or TVS_NOTOOLTIPS' turn tooltips onSetWindowLong TreeView1.hwnd, GWL_STYLE, GetWindowLong(TreeView1.hwnd, _    GWL_STYLE) And (Not TVS_NOTOOLTIPS)