Using Images
Like the listview control, the treeview control needs to be 'bound' to
an image control. To do this, add an ImageList Control to your form, name it, and add any
images you want to use in the TreeView control to it. Be sure to set the image size first
(normally set to 16x16). Set keys if you wish, as this makes it easier to identify each
image. It is best to stick with one case system (ie all caps, all lowercase etc).
Now, change the ImageList property of the TreeView control to the name of
the ImageList you want to use. Now, when you add a new node to the control, you can
specify and image index or key too. That image will then be displayed next to the node.
The following code adds a new node, with the image "TextFile" displayed next to
it.
TreeView1.Nodes.Add , , , "TestImageItem",
"TextFile"
You can also specify a image to be displayed when the item is selected .
The following code adds a new node. The image "FolderClosed" will be displayed,
and when it is selected, "FolderOpen" will be displayed (like the folders in
explorer).
TreeView1.Nodes.Add , , , "TestFolderItem",
"FolderClosed", "FolderOpen"
Note that in place of the text used to identify the image, you can also
use its index:
TreeView1.Nodes.Add , , , "TestImageItem", 1