Tab canvas disappears at run time

Hi,
I have a Content canvas with a data block displaying fields in the top section of the canvas_main. Bottom half of the canvas_main has canvas_tab with three tab pages tab1, tab2, tab3 all have data block (child records fo above block) each.
At run time I can see the canvas main with its items but cannot see the tab pages.
since I execute a query in WHEN-NEW-FORM-INSTANCE which is supposed to populate fields in canvas_main as well as child records in tab pages. I have inlcuded debug messages to see if tab page does appear or not. So the tab pages do appear and also display child record but tab canvas does not stay on the scree.
Did try to use SHOW_VIEW('tab_canvas') without any luck.
Any advice is greatly appreciated.
Thanks

Hi,
a tab canvas is like a stacked canvas.
Both canvas types disappear, when they lie over an item, with input focus. When you press next block / next item (when the items on the tab canvas belong to the same block) should display the canvas again. When this is true, I am probably right.
Regards
Hans

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