Disappearing Canvases Any Ideas?

Question

On my form the screen is split into two canvases, one contains system information (basically two text fields) this canvas (stacked) is displayed on every form in the system.
The main part of the screen is a content canvas which holds the tree view and other items. When I click on the tree view (and only when I click on the tree view) the stacked canvas disappears for no apparent reason. Any ideas why this could be happening?
I can click anywhere else on the content canvas and nothing happens but as soon as my mouse is clicked within the tree view my stacked canvas disappears. Any ideas?

Answer 1

I have placed a trigger - WHEN-MOUSE-CLICK - on the
tree within it has the code:
-- Heading canvas disappears - currently
unexplainable
DECLARE
     v_id ViewPort;
BEGIN     
--     v_id := Find_View('Heading');
--     Set_View_Property(v_id, VISIBLE, PROPERTY_TRUE);
--     Show_View(v_id);
     show_view('heading');
END;
I tried both methods hence the commented out code.
This trigger was added to try and solve the problem
of the canvas disappearing, hence doesn't affect it
being displayed.
Even if I remove the trigger the canvas still
disappears.
Any further ideas?Remove all codes with show_view, hide_view in your form.
Set raise-on-entry property to N of both canvases.
Add
show_view('name of content canvas');
show_view('name of stack canvas');
in when-new-form-instance trigger.