Validation vs Stack canvas on tab page

Hi,
I have a problem about how to show/hide view when validation was triggered.
My situation is:
- I have a 3 pages tab-page. On the first tab, I have a stack canvas. I have codes to show the canvas at When-new-form-instance and show/hide the view at When-Tab-page-change.
Problem:
- I click on the third page and enter something wrong values on a field and then I didn't go to another field, click the first page directly.
The oracle form shows the first tab without the stack canvas and the error message popup at the same time.
- We have a backend procedure which is used to give the error include the Raise form_trigger_failure. When the validation is fail, this procedure will be called to give the error message. It is a standard procedure so we must use it.
- I tried to Show_view before or after the error message, but it cannot help.
Question:
Is there any method to help this problem? Thanks for advance..
I am using Forms10g.
Regards.

Another solution without a timer : You can use the WHEN-TAB-PAGE-CHANGED-Trigger to handle the change of a tabpage. And here, before you navigate to another tabpage, you can use the built-in ENTER to start the validation before the next tabpage is displayed.+When-tab-page-changed runs AFTER the tab page has switched. If you run validation from it, you will need to check if the validation failed, and then go back to the prior tab page.
Also, the Validate built-in is a better method to cause validation to occur.

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<BLOCKQUOTE><font size="1" face="Verdana, Arial">quote:</font><HR>Originally posted by carusab ():
I think a stacked canvas "stays put",
a stacked canvas has no relation to
another canvas so it will not "know" that
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/Charles<HR></BLOCKQUOTE>
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