Try following:

this.grdRequirements.recordsource = ""
this.grdRequirements.recordsourcetype = 1
thisform.grdRequirements.ColumnCount=-1
this.grdRequirements.recordsource = "csrRequiredClasess"

>In addition to what John said, look to "VFP Grids Part I" article here, where this problem explained in detail.
>
>Interesting set of articles. Actually it seems that I want reconstruction! I tried the following:
>
>

>if type("thisform.pgfwiz.page3.grdRequirements") = "O"
>    thisform.pgfwiz.page3.removeobject("grdRequirements")
>endif
>thisform.pgfwiz.page3.AddObject('grdRequirements','Grid')
>this.grdRequirements.recordsource = "csrRequiredClasess"
>this.grdRequirements.recordsourcetype = 1
>this.grdRequirements.left 	= 2
>this.grdRequirements.height 	= 252
>this.grdRequirements.width 	= 492
>this.grdRequirements.visible	= .t.
>this.grdRequirements.refresh()
>

>
>This brings up a grid with the correct headers -- but no data is present and all the delete markers are darkened. The underlying cursor has 3 records in it. By the way, I am using VFP 6 in this situation.
>
>Thanks,
>
>Kevin