RadButton with image blinking on mouse over

[Michael]

I have a radbutton control in a radgrid that blinks when I mouse over or mouse out.
The project is using Telerik.Web.UI version 2012.1.411.35 and is running in DNN v6.2.2.
Looking at the Google Chrome development window; it seems like the image is being reloaded but before it is reloaded an about:black page is shown. (see attached image)
Any idea why it would be going back to the server to get this image and why about:blank is displaying?

<telerik:RadButton ID="INFO" runat="server" AutoPostBack="False" CausesValidation="False"
                                    Height="20px" OnClientMouseOver="infoRow"
                                    Text="" UseSubmitBehavior="False"  Width="36px" Image-ImageUrl="/images/i_info.png" Image-EnableImageButton="True" rowid="" Image-IsBackgroundImage="True">
                               </telerik:RadButton>


Thanks

[Slav]

Hi Michael,

Most probably the blinking effect is caused by a problem with caching the image of the RadButton. Please check if the issue persists when you specify the button's background image by creating a CSS class that sets the image as background via the background CSS property and passing the name of this class to the CssClass property of the RadButton.

Regards,
Slav
the Telerik team