Menu on MDIDock failing after all sheets are closed

Hi All

I am trying out PB12.6 Classic.

I created a template MDI application "mdi_test". It generates a target, PBL, a MDIframe, 3 sheets, n_mdi_test_sheetmanager etc.

I change the code in n_mdi_test_sheetmanager.of_opensheet

from li_rc = OpenSheet(lw_sheet, as_sheetname, w_mdi_test_frame, 0, Cascade!)

to li_rc = OpenSheetAsDocument(lw_sheet, as_sheetname, w_mdi_test_frame, as_sheetname)

I change the Window Type of w_mdi_test_frame from mdihelp! to mdidockhelp!

Start the application. Open sheets 1, 2, 3 one by one..works file.

After the last sheet is closed..the menu which is connected to the frame m_mdi_test_frame is not restored back.

Nothing happens while clicking on any menu item.

Has anybody experienced something like this?

Is this a bug or am I missing some other setting?

Thanks

Vinay