Why Can't we have JCanvas for developing Custom LightWeight Components?

Well!
I am Sandeep - [email protected]
I am developing a application for showing images
and Every time I read a new Image ,
I have to resize the Window 'MANUALLY'
so that it appears .
I am showing it on JPanel which is in JScrollPane
I have tried all invalidate - validate() and repaint()
on JScrollPane and JPanel also .
I tried shuffling size of main JFrame also but failed.
I have resize the JFrame manually to make Inage
Appear.
So I created new Object of 'myclass extends JPanel'
and put it in JScrollPane as setViewportView(...)
well I dont like to create new object of my
JPanel-subclass.
Can u help me.
Also I tried to use Canvas but as my application
is in SWING , it overlaps so i want some thing like
JCanvas ?
Do we Have It?

if you're calling the methods on Toolkit to load the image, pass in the component as the ImageObserver. This way when the image is finished loading, it will repaint itself.

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