What version of ADT are you using? You have posted to the ADT 2004 group, but it appears from the image that you are using 2006. Assuming that you want to get rid of the on-screen command line, and not simply get rid of the "specify opposite corner" prompt, you can either disable dynamic input altogether by deselecting the "DYN" button on the Application Status Bar -OR- right click the DYN button and choose Settings... from the context menu. In the Dynamic Prompts area, uncheck the "Show command prompting and command input near the crosshairs" toggle.
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David Koch
Autodesk Discussion Group Facilitator