You need to work with HEScript to access the UI items like the status bar. Use ChangeStatusBar: sets the text of the status bar.
Code:
procedure ChangeStatusBar(const Text: String; Reset: Boolean); * Text: new text to show in the status bar.
* Reset: if true, the text will be set as the default text.
For instance: ChangeStatusBar("Extracting Loan data... Please Wait.",false);