In the C1TaskbarButton.Buttons Collection Editor dialog box you can add thumbnail buttons to the taskbar and customize the appearance and behavior of each button. To access the Buttons Collection Editor, select the Edit Thumbnail Buttons link from the C1TaskbarButton control's Tasks menu, context menu, or below the Properties window, or click the ellipses button next to the Buttons property in the Properties window.

The Buttons Collection Editor appears similar to the following:

You can select an item in the Members list or, using the buttons below the list, you can add and remove buttons or copy existing buttons. For each button you can set or change icon, image, and background for the button, the ToolTip that appears on mouse hover, the name of the button, and if it's enabled, interactive, and visible.