Hide the Canvas dynamically

All,
I am working in 11i instance, I have created a Custom Form using Template.fmb and my requirement is like this...
we have multiple canvases in one window, dynamically we have to display and hide the canvases and I have used the below code in WHEN_NEW_FORM_INSTANCE trigger but it is not working....
SHOW_VIEW('ID_CANVAS');
HIDE_VIEW('ENCLO_CANVAS');
Can someone help me....
Thanks,

One more thing, I have created custom Horizontal Toolbar canvas & Vertical Toolbar canvas and assigned to the window... at runtime toolbars are not visible....I haven't worked with Horizontal or Verticle toolbars very often, however, you have to make sure you change the following properties of your Window object:
Horizontal Toolbar Canvas and Vertical Toolbar Canvas
Make sure you set these properties to your toolbar canvases that you created.
Craig...

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Fedor,
Now also i am getting the same output.
My requirement is i have to create the viewobject as it is in BaseVO and to hide some of the columns dynamically.
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<variableIterator id="variables"/>
<iterator Binds="DynamicVO" DataControl="AppModuleDataControl"
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<bindings>
<tree IterBinding="DynamicVOIterator" id="DynamicVO">
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EmpoyeeID FirstName Lastname
100 King
101 Kochhar
i firstname column to be hidden.
Reg
vini

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