how to remove bluebar appearing from opening of one child form into anather in vb.net

hi all,

My application having one mdiform in that form six child forms are there.Switching of one form into anather form blue bar is appearing form at the title of every opened child form.These six child forms are opens in mdiform.how to remove the blue bars are appearing from every opened child form in mdiform.how to remove these blue bar.

I have tested this "NewMDIChild.Location = New Point(x,y)".but blue bars are not remove in the opening of mdichild form into mdiform.

This bars are appearing in the opening condition of mdichild form after clicking any button in the mdiform.To avoid that issue please help me.

Thanks,
Jayawant.