Title bar of a form is shown when it is hidden at design time.

Question

I have a form which I am using as a progressbar and in the worker thread I am doing some long running background processing. As soon as I am done with the processing I invoke a function in the main thread so that the progressbar is closed.
The behaviour of this progressbar is modal, but at the time of its closing, I am able to click some links in the main form. Though it does not throw any error or cause any unexpected behaviour, I get to see the progressbar form's title bar, which should not be there. At design time I have hidden this title bar.
I want to remove this title bar so that it will not be visible in any case. or you can suggest some other solution as well. Please help.