ImageManager: Alert on 'file exists' is multiplied

[snowolf]

in the Editor, click on the Image Manager tool, then click "Upload",
uncheck "Overwrite if file exists?".
If I upload three existing files, I get an alert dialog with three times of "A file with a name same as the target already exists!".

Is there a way to only display one error message "A file with a name same as the target already exists!"?

I found a post and it seems like the solution doesn't work for me or maybe I miss something.
http://www.telerik.com/community/forums/aspnet-ajax/file-explorer/alert-on-file-exists-is-multiplied-with-the-number-of-uploads.aspx

I'm using custom control which inherited from RadEditor.
I tried to add the following code in the custom control, but rfe is always null.

protected override void EnsureChildControls()
......
Telerik.Web.UI.RadFileExplorer rfe =
                (Telerik.Web.UI.RadFileExplorer)this.FindRadControl(this.Page);
            if (rfe != null)
            {
                rfe.ItemCommand += new RadFileExplorerEventHandler(radFileExplorer_ItemCommand);
            }
}

private Control FindRadControl(Control parent)
        {
            foreach (Control c in parent.Controls)
            {
                if (c is Telerik.Web.UI.RadFileExplorer) return c;
                if (c.Controls.Count > 0)
                {
                    Control sub = FindRadControl(c);
                    if (sub != null) return sub;
                }
            }
            return null;
        }

protected void radFileExplorer_ItemCommand(object sender, RadFileExplorerEventArgs e)
        {
            switch (e.Command)
            { 
                case "UploadFile":
                    //should I check the existence here?
                    break;
                default:
                    break;
            }
        }

[Rumen]

Hi Snowolf,

You can see how to get a reference to the RadUpload control in the Upload dialog of the Image manager in this KB article: Displaying single upload control in the FileBrowser Upload manager.

Best regards,
Rumen
the Telerik team