RadButton stays visible on the page all the time after Radgrid reload - radgrid

Question

I have a page where I search the data and populate RadGrid.
The page has a button to export the data into Excel.
Everything works fine, data is exporting. I can search as well.
I hide the button and RadGrid in the code when the Grid is empty:
btnExport.Visible = false;
gridDisplay.Visible = false;
However, when RadGrid is empty, it becomes hidden but button is still displayed.
I build the RadGrid inside of the RadAjaxPanel:
<telerik:RadAjaxPanel ID="RadAjaxPanel2" runat="server" LoadingPanelID="RadAjaxLoadingPanel2">
<telerik:RadGrid
RenderMode="Lightweight"
runat="server"
ID="grdMoss2Merchants"
AllowPaging="True"
AllowSorting="true"
PagerStyle-AlwaysVisible="true"
OnNeedDataSource="BindToDatasource"
OnSortCommand="grdMoss2Merchants_SortCommand"
ViewStateMode="Enabled"
AutoGenerateColumns="false"
OnPageIndexChanged="grdMoss2Merchants_ChangePage"
ClientSettings-Scrolling-ScrollHeight="360px">
<GroupingSettings CaseSensitive="false"/>
<ExportSettings HideStructureColumns="true" ExportOnlyData="true" OpenInNewWindow="true" Excel-Format="Xlsx" IgnorePaging="true" FileName="Moss2Merchants">
<Excel WorksheetName="Moss2Merchants" Format="Xlsx" AutoFitColumnWidth="AutoFitAll" />
</ExportSettings>
<ClientSettings EnableRowHoverStyle="true">
<Scrolling AllowScroll="true" UseStaticHeaders="True"/>
<ClientEvents OnKeyPress="keyPress" />
</ClientSettings>
<SortingSettings EnableSkinSortStyles="false" />
<HeaderStyle Width="160px" CssClass="grdHeader" ForeColor="#2E6E9E" />
<MasterTableView AllowNaturalSort="false">
<PagerStyle AlwaysVisible="true" Mode="NextPrevAndNumeric" PageSizes="10,25,50,100" />
<Columns>
<telerik:GridBoundColumn DataField="Moss2 MID" HeaderText="MOSS2 MID" AllowSorting="false" DataFormatString="{0:#}"></telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="DBA" HeaderText="DBA" HeaderStyle-Width="250px">
</telerik:GridBoundColumn>
<telerik:GridBoundColumn DataField="Original MID" HeaderText="ORIGINAL MID" AllowSorting="false" DataFormatString="{0:#}"></telerik:GridBoundColumn>
<telerik:GridBoundColumn
DataField="BoardingDate"
DataType="System.DateTime"
HtmlEncode="false"
DataFormatString="{0:MM/dd/yyyy}"
SortExpression="BoardingDate"
UniqueName="BoardingDate"
HeaderText="BOARDING DATE"
HeaderStyle-Width="170px"
ShowFilterIcon="false"
/>
<telerik:GridBoundColumn DataField="Status" HeaderText="STATUS" AllowSorting="false"></telerik:GridBoundColumn>
</Columns>
</MasterTableView>
</telerik:RadGrid>
</telerik:RadAjaxPanel>
This just a simple code to generate a button outside of the Grid:
<div>
<telerik:RadButton ID="btnExport" runat="server" OnClick = "btnExportClick" Text="Export To Excel" CausesValidation="false"/>
<br/>
</div>
I'm not sure what I'm doing wrong here.
Need some assistance