Vertical Scroll in stacked canvas

Question

Dear all,
I got the following challange:
On my form I have 1 content and 1 stacked canvas. Items are from 1 datablock. 1 item is displayed on content canvas, the other items from the datablock are on the stacked canvas. Items are displayed in multirow mode, stacked canvas has a horizontal scrollbar, item labels are dispayed (on content and stacked canvas).
Vertical scrolling works fine in the Forms Builder test environment (C/S), but when the form runs on the web in the applet, vertical scrolling performs as follows:
If the input focus is in the column on the content canvas, it works fine. But if the input focus is in a column on the stacked canvas and an item in the last row (during scrolling down) gets the input focus, the content of the stacked canvas is shifted up to the upper border, so that the column headers and the first line of the viewport isn't displayed and there is an offset of the records displayed on the canvases.
Has anyone experience with this behaviour, any ideas or a workaround?
Many thanks in advance
Stefan

Answer 1

I have seen that too, with tab canvas, which is like a stacked canvas.
On mine, it occurs after a clear_form and synchronize, but before I execute any queries (there are multiple blocks and queries).
So what I added was this, following the Synchronize:
Declare
  Tab_View_id      Viewport     := Find_View('TAB');
Begin
  if get_view_property(Tab_View_id,Visible) = 'FALSE' then
    show_view(Tab_View_id);
  end if;
End;I actually put the Tab_View_ID variable into a package spec, so Forms only needs to set it once.
If you can't find the right place to add the code, a form-level when-new-item-instance trigger will work.