FIX: GDI Resource Leak Using Checkboxes in Treeview Control (228859)

MORE INFORMATION

Steps to Reproduce Behavior

1. Open a new Visual Basic Standard EXE project. Form1 is created by default.
2. Add a Command Button to Form1.
3. Add the following code to the General Declarations section of Form1:

   Private Sub Command1_Click()
      Dim f As Form2
      Dim i As Long
      For i = 0 To 100
         Set f = New Form2
         f.Show
         Unload f
         DoEvents
         Set f = Nothing
      Next i
   End Sub
   					

4. On the Project menu, click Add Form to add a second form to the project. Form2 is created by default.
5. On the Project menu, click Components. Check Microsoft Windows Common Controls 6.0 and click OK.
6. Add a Treeview control to Form2.
7. Add the following code to the General Declarations section of Form2:

   Private Sub Form_Load()
      TreeView1.Checkboxes = True
      TreeView1.Nodes.Add , , , "Item1"
      TreeView1.Nodes.Add , , , "Item2"
      TreeView1.Nodes.Add , , , "Item3"
   End Sub
   					

8. Start a program to monitor system resources as follows:
   • Windows NT: Enter CTRL+ALT+DEL and click the Task List button. Select the Monitor tab.
   • Windows 95/98/Me: Start the System Monitor tool, which is located in the System Tools folder in the Accessories folder. (If the System Monitor tool is not available, it can be installed from the Control Panel using the Add/Remove Programs option.) On the Edit menu, click Add Item. Click the Memory Manager Category, click the Allocated Memory Item, and click OK.
9. Run the project. Click the Command1 button on Form1. Notice the resource usage. Most of the time, resources fall below the critical level on the first run and, if not, they should on the second run.
   
   Result: Excessive resource use.