.DNNEmptyPane class works wonderfully in DNN 5.1 but I can't seem to use it with older version.  Is there a way to use this class?

As that is "just" a CSS class, you can certainly use it. The question is: how?

I would look around to see how it is used in DotNetNuke 5.1. Presumably, that class gets assigned dynamically to panes that have no content. It is probably in code, or at least in javascript/jquery.

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It is defined in default.css and in Minimal Extropy's skin.css.  It is used in ControlPanel.js.

It does work in DNN 5.1 but it wont work in older version. I need to get it to work in the older version. right now I have
.DNNEmptyPane
{ width: 0px; display:none; border:none; padding:0px; margin:0px; height:0px; } at the bottom of style sheet. What else do I need to do?

You need to apply that class to an object to make it shrink to nothing.  You'll need to determine which objects need it, and then set their class to it. 

I read somewhre that DNN adds "DNNEmptyPane" to the class of an empty pane (no modules added). so if I have a code like this,

               

would this code work with DNNEmptyPane?

i tried to copy paste my code, but why is it coming up like that? it wont show.  anyway, I'm using snapsis menu on my site and i have left, right, and content pane.  I have third level menu code embed in left pane.  is this going to work with DNNEmptypane? since it collapses pane that dont have module?

I found some discussion here.

From that thread, it seems that versions after 4.6 use that class.  And, it seems to be injected automatically.

If you are having trouble, it might be helpful to you to ask additional questions in that thread.

oh thank you. I'll check that out. I have other question. How do you create right content that stays in every page. So that if i make a change in that module, it'll take that change in every page

Create the module contents and then, in the module's settings, check the box so that the module appears on every page.

I'm using version 04.05.03 of the community version. and I am very new to DNN. I added an Events module to a page and the module indicates in red "Please update module settings...contact Portal Admin." When i go to the setting of the module it gives me the message "Error: Module is currently unavailable." I then went to Host/Module Definitions and verified that the Events is an installed Module. Under Available modules there are no modules listed that have not been installed. Could you give me any helpful information?

First, I recommend that you use a current version of DotNetNuke. Version 5.1.4 is the most recent version. If you have to stay with Version 4.x, then you will want to use 4.9.4. It's likely that the version of the Events Module you have is not compatible with the old version of DotNetNuke.