With TargetControlID="Panel1" and ScrollContents="true" I get a horizontal scrollbar regardless of the contents of Panel1. I really want to get rid of this.

(I use the toolkit)

Anyone?

Get rid of the ScrollContents="true".  Your panel will then behave like you would normally expect a panel to.

Use ScrollContents="false" & see it

I have tried that without success. I also tried to set ScrollBars="Auto" on the Panel but without any effect... Forgot to mention that the collapsiblepanel is inside an updatepanel..

Are you sure your panel is wide enough for the content inside?

divs normally display scrollbars when there is content to scroll to in either axis.  Try setting the panel you're collapsing to a wider width and see what it is that is cauing the scrolling

The problem is not scrollbars not showing up, but a horizontal scrollbar I'd like to get rid of... Adjusting the panel width does not seem to affect this..

Hi Lemon,

It is a css issue rather than Ajax Control Toolkit issue.  You shall set the Panel's  overflow-x to "hidden" and set its width property.  For example,

.collapsePanel {
         background-color:white;
         overflow-x:hidden;

        width:800px;
 }

Best regards,

Jonathan

You are absolutely right! Thanks a lot Jonathan!

One thing; overflow-x supported by all browsers? 

Hi Lemon,

IE 6 and above,  Firefox 1.5 above.

Best regards,

Jonathan