I have a LeftPane and RightPane which are side by side.  The RightPane top left corner curves into the LeftPane.  Both panes are colored differently.  If the RightPane is empty then the corner image will be differnent (transparent background) vs. if the RightPane is visible (colored background).

Using a table I will create ContentPane, LeftPane, Cell1, Cell2, RightPane, Cell3. 

If there are no empty panes then all is good.

If LeftPane is empty, then I need to make Cell1 hidden.

If RightPane is empty then I need to make Cell2 and Cell3 hidden.

Initially I used absolute positioned DIV's inside the cells to position my border images, which worked great.  The content insde the pane layered on top of the divs.  The problem was that the dnnMenu for the modules uses positioning and therefore, displays off the screen.  I would use another menu if I knew how.  I was hoping that this new method was going to be easier, but I'm finding it rather difficult atm.

I appreciate your help, unfortunately, I need multiple images within the container and one of them needs to be different depending on if the RightPane is visible or not.

I did find a solution, however.  I am curious if there is any advice against it or not so I'm posting my solution below.

1.  Use server side code to check if the pane contains the class "DNNEmptyPane".

2.  Use an event from a server side pane that comes after the pane you are checking.  (I added a "dummy" pane called "BottomPane" that is my final pane and therefore using it's event's to check the previous panes class names.)

3.  Create and add an HtmlLink to the page.

    Protected Sub BottomPane_Load(ByVal sender As Object, ByVal e As System.EventArgs)
        Dim value As String = RightPane.Attributes("Class").Contains("DNNEmptyPane").ToString & _
                              LeftPane.Attributes("Class").Contains("DNNEmptyPane").ToString
       
        Dim link As HtmlLink = New HtmlLink
        link.ID = value
        Select Case value
            Case "TrueTrue"
                link.Attributes.Add("href", "~/Portals/0/Skins/CB Deco 1.5/css/RS.css")
            Case "FalseTrue"
                link.Attributes.Add("href", "~/Portals/0/Skins/CB Deco 1.5/css/RS-R.css")
            Case "TrueFalse"
                link.Attributes.Add("href", "~/Portals/0/Skins/CB Deco 1.5/css/RS-L.css")
            Case "FalseFalse"
                'Me.BottomPane.Visible = False
                Exit Sub
        End Select
       
        link.Attributes.Add("type", "text/css")
        link.Attributes.Add("rel", "stylesheet")
        Me.Page.Header.Controls.Add(link)
        'Me.BottomPane.Visible = False

    End Sub
 

If you dont want the BottomPane to appear during the design time of the site then uncomment the last line.

Thank so much for your feedback, without it I would not have been able to figure out what class to look for.  As for using an event of the pane later in the process I'm not sure how to do that.  I tested each panes event...some didn't seem to fire at all...and none of them seemed to fire after dnn added the class name.  Perhaps the event didn't properly register in the html, so I could try that again...unless theres something else I should do.