Focus problem in TAB Canvas form

Hi
I am calling FormB from FormA by using
CALL_form('FormB.FMX',NO_HIDE);
But when I click on the any other field ( other than the first field in the called Form ), the screen is becoming blank, again I need to click on the Execute Query button, but after that I can click on any other field it wont go invisible.
FormB has TAB canvas
Oracle & Form Version Oracle 10g
THanks in advance

Hi,
When I run the form directly also I am getting the same problem,
Hi Tony,
<<Define what's blank??? Errors???? >> means , I need to click on the execute query button to see the data, even to see the controls in the forms.
As I said, i am calling this form from another form, and I am assign the values in the prequery, I am gettign the result propery, but when I click on any other control, the form become empty, I need to click on exec query to see the values and tex items etc.
This form has one content canvas and one tab canvas.  What are the properies to set to place tab canvas on the content canvas.

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