Set the path of the object that should be displayed as thumbnail.
property Path: UnicodeString;
The Path property contains the full path of the file or folder which thumbnail image is currently displayed. Assign a value to this property to display a different thumbnail image. Or use the ShellLink property to automatically synchronize the displayed image with other shell controls.
The following example shows the thumbnail image of the currently selected file of a TJamShellList:
if ShellList.SelectedFiles.Count>0 then ThumbnailImage.Path := ShellList.Path + ShellList.SelectedFiles;