Help URL : URL[1]: http://i.stack.imgur.com/s5ZnK.png\' This URL also display a delete button code.
Selenium IDE: Command : Target clickAndWait : id=ctl00_D
What is likely happening is the previous click element launches this "window" with the btnDelete element. So you need to either use a waitFor ( or worse, a pause (don't use pauses).
waitForElementPresent id=ctl00_Dialogproxy_deletenews_btnDelete