hello,

I please for some help in following problem...

Starting point:
JScrollPane scrollPane = new JScrollPane();
scrollPane.setPreferredSize(new Dimension(500,450));

//viewClient has got a computed mathematical grafic
JComponent viewClient = myExternLibrary.getJComponent();
scrollPane.setViewportView(viewClient);

Result:
There is a piece of the mathematical grafic(left,top piece) in the
programwindow. It is all ok.

For example:

   scrollPane:
|--------------|
|              |
|           ---|
|           \  |
|            \ |
|             \|
|              |
|<============>|
    (horizontal JScrollBar )

Problem:
If I have manipulated the visible area with buttons,all has been ok.
But if I have manipulated with knob, the JViewPort has refreshed incompletely.

for example:

I pull knob on the right and allways become(a picture). But b Picture
is korrectly.

(a picture)                 (b picture)
  scrollPane:                
|---------------|         |---------------|
|               |         |            ###|
|        --- ---|         |        ---    |
|        \   \  |         |        \      |
|         \   \ |         |         \     |
|          \   \|         |          \    |
|               |         |            ###|
|<=============>|         |<=============>|

Thanks for any help!!

best regards,
Joana