vb.net - Keeping one form on top of the calling form -

i'm using vb.net (vs2008) , have form (frmmain) calls form (frmcleanup) when frmcleanup shows can hidden behind frmmain.

what i'd have new form locked , have close rid of it?

thanks..

show form .showdialog() instead of .show().

this way, form shown modal dialog box , stay on top until close it.