ASPxGridView is empty on being placed inside a collapsed ASPxRoundPanel with LoadContentViaCallback="true"

Hello,

I am having an issue with an ASPxGridView that is located inside an ASPxRoundPanel that has LoadContentViaCallback set to true and collapsed set to true.

After initial Page Load, I expand the ASPxRoundPanel to show the grid, but it always says "No data to display" when there is data. The data only appears after I try to sort a column for example (perform a callback I assume). I even tried to bind the grid on page load, but this changes nothing. Perhaps this is a desired affect, but I'm not sure.

Here is my html markup of the panel and gridview:

ASPx
<dx:ASPxRoundPanel ID="panelInitialStageOccurence" ClientInstanceName="panelInitialStageOccurence" runat="server" Width="99%" LoadContentViaCallback="true"  
    AllowCollapsingByHeaderClick="true" ShowCollapseButton="true" HeaderText="Test" Collapsed="true">  
    <PanelCollection>  
        <dx:PanelContent>  
            <dx:ASPxGridView ID="gridInitialStageOccurrence" ClientInstanceName="gridInitialStageOccurrence" runat="server" AutoGenerateColumns="False"  
                DataSourceID="dataInitialStageOccurrence" Width="100%" KeyFieldName="THISID" EnableCallbackCompression="False" EnableCallBacks="false" >  
                <Paddings Padding="0px" />  
                <Border BorderWidth="0px" />  
                <BorderBottom BorderWidth="1px" />  
                <Columns>  
                    <dx:GridViewDataDateColumn VisibleIndex="1"  FieldName="STARTDATE" Caption="Start Date" Settings-GroupInterval="Value" >  
                        <PropertiesDateEdit DisplayFormatString="yyyy-MM-dd"></PropertiesDateEdit>  
                        <Settings GroupInterval="Value" />  
                    </dx:GridViewDataDateColumn>  
                    <dx:GridViewDataDateColumn VisibleIndex="2"  FieldName="ENDDATE" Caption="End Date" Settings-GroupInterval="Value" >  
                        <PropertiesDateEdit DisplayFormatString="yyyy-MM-dd"></PropertiesDateEdit>  
                        <Settings GroupInterval="Value" />  
                    </dx:GridViewDataDateColumn>  
                </Columns>  
                <SettingsPager Mode="ShowPager" PageSize="10" />  
            </dx:ASPxGridView>  
        </dx:PanelContent>  
    </PanelCollection>  
</dx:ASPxRoundPanel>  

Any insight you can provide will be greatly appreciated.

Thanks in advance!