Edited Issue: Extend SPRedirectWithID with Query String Parameters [10030]

If I use redirectUrl: “EditForm.aspx” in SharePoint 2010 in a Dialog, the dialog parameter ?IsDlg=1 gets lost. If I use redirectUrl: “EditForm.aspx?IsDlg=1” the final URL is in an invalid format like EditForm.aspx?IsDlg=1?ID=169.