Program VBA to create Task Pane sink Userform that has TreeView (create by BSTreeView control of BSAC) . Open Task Pane when opening Excel file.
When open file and open Task Pane you should create BSTaskPane - DO NOT use BSTaskPaneX
	
In VBA, do with step by step:
Step 1: Create Userform
Make sure you have installed Add-in A-Tools or BSAC.ocx activex controls before do Step 2
Step 2: Click to userform, see window "Toolbox", right click on tab "Controls" -> "Import Page", select file "ImportToToolbox.pag" (Download)
(Do Step 2 only if you do not see BSAC controls on Toolbox window)
Step 3: Drag controls to userform: BSTreeView (name BSTreeView1)
Set Userform1.ShowModal = False
	Step 4: Right click on userform -> View Code. Now you have widow to edit code. Copy below code:
	'-------BEGIN COPY
	'Author: Nguyen Duy Tuan - http://atoolspro.com OR http://bluesofts.net
	'       Mail: duytuan@bluesofts.net - Tel: (84) 904210337
		Option Explicit
	
		Public WithEvents TP As BSTaskPane
	
		'---------------------------------------------------------
	
		Private Sub UserForm_Initialize()
	
		    'Create TreeView
	
		    Dim Node As BSTreeNode, I&
	
		    'Parent. Function UNC() convert TCVN3,VNI-> Unicode
	
		    Set Node = BSTreeview1.Items.Add(, "mh", UNC("PURCHASE - Mua hµng"))
	
		    Node.Bold = True 'Format font is bold
	
		    Set Node = BSTreeview1.Items.Add("mh", "mh1", UNC("Mua hµng dÞch vô")) 'Child
	
		    Set Node = BSTreeview1.Items.Add("mh", "mh2", UNC("Mua hµng nhËp kho")) 'Child
	
		    Set Node = BSTreeview1.Items.Add("mh", "mh3", UNC("Mua hµng nhËp khÈu")) 'Child
	
		    'Parent. Function UNC() convert TCVN3,VNI-> Unicode
	
		    Set Node = BSTreeview1.Items.Add(, "bh", UNC("SALES - B¸n hµng"))
	
		    Node.Bold = True 'Format font is bold
	
		    Set Node = BSTreeview1.Items.Add("bh", "bh1", UNC("B¸n hµng dÞch vô")) 
	
		    Set Node = BSTreeview1.Items.Add("bh", "bh2", UNC("B¸n hµng xuÊt lÎ")) 
	
		    Set Node = BSTreeview1.Items.Add("bh", "bh3", UNC("B¸n hµng xuÊt bu«n")) 
	
		    'Create REPORTS
	
		    Set Node = BSTreeview1.Items.Add(, "rp", UNC("REPORT- B¸o c¸o qu¶n trÞ")) 'Parent
	
		    Node.Bold = True 'Format font is bold
	
		    'Create child in for...next
	
		    For I = 1 To 50
	
		        Set Node = BSTreeview1.Items.Add("rp", "rp" & I, UNC("B¸o c¸o qu¶n trÞ Þ" & I)) 'Child
	
		    Next I
	
		    'Open node full
	
		    BSTreeview1.FullExpand
	
		    BSTreeview1.Items(0).Selected = True 'First node seleted    
	
		    'Create Task Pane
	
		    Dim TPs As New BSTaskPanes 'Task Pane Engine
	
		    Set TP = TPs.Add("My menu", Me, False, dpLeft)
	
		    TP.DockPositionRestrict = msoCTPDockPositionRestrictNoHorizontal 'No dock on top, bottom
	
		End Sub
	
		'---------------------------------------------------------
	
		Private Sub UserForm_Terminate()
	
		    On Error Resume Next 'Important! 
	
		    If Not TP Is Nothing Then
	
		        TP.Remove 'Delete Task Pane when unload userform
	
		    End If
	
		End Sub
	
		'---------------------------------------------------------
	
		Private Sub UserForm_Resize()
	
		    On Error Resume Next 'Important!
	
		    BSTreeview1.Height = Height - BSTreeview1.Top - 2
	
		    BSTreeview1.Width = Width - BSTreeview1.Left * 2
	
		End Sub
	
		'---------------------------------------------------------
	
		Private Sub BSTreeview1_OnNodeClick(ByVal Node As BSAC.BSTreeNode)
	
		    MsgBoxW Node.Text, vbInformation, "Node's Key: " & Node.Key
	
		End Sub
	
		'---------------------------------------------------------
	
		Private Sub Image1_MouseDown(ByVal Button As Integer, ByVal Shift As Integer, ByVal X As Single, ByVal Y As Single)
	
		    ShellExecute 0, "OPEN", "http://atoolspro.com"
	
		End Sub
	'-------END COPY
	(*) Download Source code
	(*) Support online: https://www.facebook.com/groups/hocexcel/