ASPxGridView - PopupEditForm blinks when it is shown

Hi team.
I call ASPxPopupControl from EditForm template of ASPxGridView.
ASPxPopupControl is located outside of EditForm template and called from the click on ASPxButtonEdit button.
Here is markup:

ASPx
<dx:ASPxGridView ID="ASPxGridViewUsage" runat="server" AutoGenerateColumns="False"  
    ClientIDMode="AutoID" ClientInstanceName="ASPxGridViewUsage" CssFilePath="~/App_Themes/DevEx/{0}/styles.css"  
    CssPostfix="DevEx" DataSourceID="SqlDataSourceAppointmentUsage" EnableCallBacks="False"  
    Font-Names="Verdana" Font-Size="8pt" KeyFieldName="UsageID" Width="1250px">  
    ...  
    <Columns>  
        <dx:GridViewDataButtonEditColumn Caption="Invoice To" FieldName="BillingClientName"  
            Name="BillingClientName" VisibleIndex="12" Width="400px" Visible="False">  
            <PropertiesButtonEdit ClientInstanceName="UsageInvoiceToClientName">  
                <ClientSideEvents ButtonClick="function(s, e) {PopupAddressBook1.Show();}" />  
                <Buttons>  
                    <dx:EditButton Position="Right" ToolTip="Select Client">  
                    </dx:EditButton>  
                </Buttons>  
            </PropertiesButtonEdit>  
            <EditFormSettings Visible="true" VisibleIndex="12" />  
        </dx:GridViewDataButtonEditColumn>  
    </Columns>  
    <Templates>  
        <EditForm>  
            <div style="padding: 4px 4px 3px 4px">  
                <dx:ASPxGridViewTemplateReplacement ID="Editors" runat="server" ReplacementType="EditFormEditors" />  
            </div>  
            <div style="padding: 4px 4px 3px 4px">  
                <dx:ASPxButtonEdit ID="ASPxButtonEditUsageInvoiceToClientName" runat="server" ClientIDMode="AutoID"  
                    ClientInstanceName="ASPxButtonEditUsageInvoiceToClientName" CssFilePath="~/App_Themes/SoftOrange/{0}/styles.css"  
                    CssPostfix="SoftOrange" ReadOnly="True" SpriteCssFilePath="~/App_Themes/SoftOrange/{0}/sprite.css"  
                    OnButtonClick="ASPxButtonEditUsageInvoiceToClientName_ButtonClick" Width="300px"  
                    Text='<%# Eval("BillingClientName") + ""%>'>  
                    <ClientSideEvents ButtonClick="function(s, e) {PopupAddressBook1.ShowAtElement(this);}" />  
                    <Buttons>  
                        <dx:EditButton>  
                        </dx:EditButton>  
                    </Buttons>  
                </dx:ASPxButtonEdit>  
            </div>  
            <div style="text-align: right; padding: 4px 4px 3px 4px">  
                <dx:ASPxGridViewTemplateReplacement ID="UpdateButton" runat="server" ReplacementType="EditFormUpdateButton" />  
                <dx:ASPxGridViewTemplateReplacement ID="CancelButton" runat="server" ReplacementType="EditFormCancelButton" />  
            </div>  
        </EditForm>  
...  
    </Templates>  
</dx:ASPxGridView>  

I have few other issues that are related to this scenario of having popoup called from another popup (EditForm).
I remember your rules of opening separate case for it, but maybe in this case it would reduce work for everyone due to you are already familiar with pre-conditions.
So I try to ask.
2)     The 2nd popup (Address Book) has ASPxGridView inside, when I move between pages of the grid the whole popup blinks and blinks so hard that it disappears from display entirely and reappears again (with new selected page – new page as expected, but blinking is not), but if I use filter selection of the same grid then it acts normal. Only clicks on page triggers such behavior.
Where should I look to prevent both issues from happening?
thanks