Goes up one level in the file system structure.
function GoUp: Boolean; override;
True if the command was executed successfully.
This method makes the parent folder of the current folder the new active folder, which contents will be displayed in the TJamShellList.
The following lines of code will show a message box with the Text "C:".
JamShellList.Path := 'C:Windows'; JamShellList.GoUp; ShowMessage(JamShellList.Path);